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# 9f526057 12-Apr-2022 Fangrui Song <[email protected]>

[ubsan][test] Unsupport Android for new test diag-stacktrace.cpp

https://reviews.llvm.org/D123562#3446485 reported that the test failed
on arm-linux-android.
# fdd424e3 12-Apr-2022 Fangrui Song <[email protected]>

[ubsan] Fix print_stacktrace=1:fast_unwind_on_fatal=0 to correctly fallback to fast unwinder

ubsan_GetStackTrace (from 52b751088b11547e0f4ef0589ebbe5e57752c68c) called by
~ScopeReport leaves top/bot

[ubsan] Fix print_stacktrace=1:fast_unwind_on_fatal=0 to correctly fallback to fast unwinder

ubsan_GetStackTrace (from 52b751088b11547e0f4ef0589ebbe5e57752c68c) called by
~ScopeReport leaves top/bottom zeroes in the
`!WillUseFastUnwind(request_fast_unwind)` code path.
When BufferedStackTrace::Unwind falls back to UnwindFast,
`if (stack_top < 4096) return;` will return early, leaving just one frame in the stack trace.

Fix this by always initializing top/bottom like 261d6e05d5574bec753ea6b7e9a7f99229927753.

Reviewed By: eugenis, yln

Differential Revision: https://reviews.llvm.org/D123562

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