[lldb][tests] Automatically call compute_mydir (NFC)

Eliminate boilerplate of having each test manually assign to `mydir` by calling
`compute_mydir` in lldbtest.py.

Differential Revision: https://r

[lldb][tests] Automatically call compute_mydir (NFC)

Eliminate boilerplate of having each test manually assign to `mydir` by calling
`compute_mydir` in lldbtest.py.

Differential Revision: https://reviews.llvm.org/D128077

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[lldb] [test] Update baseline test status for FreeBSD

Fixes #19721
Fixes #18440
Partially fixes bug #47660
Fixes #47761
Fixes #47763

Sponsored by: The FreeBSD Foundation

[lldb] Don't save empty expressions in the multiline editor history

Right now running `expr` to start the multiline expression editor and then
pressing enter causes an empty history empty to be crea

[lldb] Don't save empty expressions in the multiline editor history

Right now running `expr` to start the multiline expression editor and then
pressing enter causes an empty history empty to be created for the multiline
editor. That doesn't seem very useful for users as pressing the 'up' key will
now also bring up these empty expressions.

I don't think there is ever a use case for recalling a completely empty
expression from the history, so instead don't save those entries to the history
file and make sure we never recall them when navigating over the expression
history.

Note: This is actually a Swift downstream patch that got shipped with Apple's
LLDB for many years. However, this recently started conflicting with upstream
LLDB as D100048 added a test that made sure that empty expression entries don't
crash LLDB. Apple's LLDB was never affected by this crash as it never saved
empty expressions in the first place.

Reviewed By: augusto2112

Differential Revision: https://reviews.llvm.org/D108983

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[LLDB] Skip random fails on Arm/AArch64 Linux buildbot

Following tests fail on Arm/AArch64 randomly with timeouts:

TestMultilineNavigation.py
TestBatchMode.py
TestUnicode.py
TestGdbRemote_vContThre

[LLDB] Skip random fails on Arm/AArch64 Linux buildbot

Following tests fail on Arm/AArch64 randomly with timeouts:

TestMultilineNavigation.py
TestBatchMode.py
TestUnicode.py
TestGdbRemote_vContThreads.py

I am marking them as skipped until we find a away make to pass reliably.

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[LLDB] Skip random failing tests on Arm/AArch64 Linux bots

Following tests have been failing randomly on LLDB Arm and AArch64 Linux
builtbots:

TestMultilineNavigation.py
TestMultilineCompletion.py

[LLDB] Skip random failing tests on Arm/AArch64 Linux bots

Following tests have been failing randomly on LLDB Arm and AArch64 Linux
builtbots:

TestMultilineNavigation.py
TestMultilineCompletion.py
TestIOHandlerCompletion.py
TestGuiBasic.py

I have increased allocated CPU resources to these bots but it has not
improved situation to an acceptable level. This patch marks them as
skipped on Arm/AArch64 for now.

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[lldb][Editline] Fix crash when navigating through empty command history.

An empty history entry can happen by entering the expression evaluator an immediately hitting enter:

```
$ lldb
(lldb) e
En

[lldb][Editline] Fix crash when navigating through empty command history.

An empty history entry can happen by entering the expression evaluator an immediately hitting enter:

```
$ lldb
(lldb) e
Enter expressions, then terminate with an empty line to evaluate:
1: <hit enter>
```

The next time the user enters the expression evaluator, if they hit the up arrow to load the previous expression, lldb crashes. This patch treats empty history sessions as a single expression of zero length, instead of an empty list of expressions.

Fixes http://llvm.org/PR49845.

Differential Revision: https://reviews.llvm.org/D100048

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[lldb] [test] Link FreeBSD test failures to bugs

Differential Revision: https://reviews.llvm.org/D92740

[lldb] [test] Update XFAILs/skips for FreeBSD

Update expected failures and test skips based on common results
for the old and new FreeBSD plugins.

[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdi

[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdir -p lldb/test/API/{test_runner/test,tools/lldb-{server,vscode}}
mv lldb/packages/Python/lldbsuite/test/test_runner/test lldb/test/API/test_runner
for d in $(find lldb/packages/Python/lldbsuite/test/* -maxdepth 0 -type d | egrep -v "make|plugins|test_runner|tools"); do mv $d lldb/test/API; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-vscode -maxdepth 1 -mindepth 1 | grep -v ".py"); do mv $d lldb/test/API/tools/lldb-vscode; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-server -maxdepth 1 -mindepth 1 | egrep -v "gdbremote_testcase.py|lldbgdbserverutils.py|socket_packet_pump.py"); do mv $d lldb/test/API/tools/lldb-server; done
```

lldb/packages/Python/lldbsuite/__init__.py and lldb/test/API/lit.cfg.py were also updated with the new directory structure.

Reviewers: labath, JDevlieghere

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71151

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