Merge commit b84d773fd004 from llvm git (by Fangrui Song):

[Parallel] Revert sequential task changes

https://reviews.llvm.org/D148728 introduced `bool Sequential` to unify
`execute` and the o

Merge commit b84d773fd004 from llvm git (by Fangrui Song):

[Parallel] Revert sequential task changes

https://reviews.llvm.org/D148728 introduced `bool Sequential` to unify
`execute` and the old `spawn` without argument. However, sequential
tasks might be executed by any worker thread (non-deterministic),
leading to non-determinism output for ld.lld -z nocombreloc (see
https://reviews.llvm.org/D133003).

In addition, the extra member variables have overhead.
This sequential task has only been used for lld parallel relocation
scanning.

This patch restores the behavior before https://reviews.llvm.org/D148728 .

Fix #105958

Pull Request: https://github.com/llvm/llvm-project/pull/109084

This fixes the non-reproducibility we had noticed when linking our EFI
loaders, and for which we committed a workaround in f5ce3f4ef562.

MFC after: 3 days

(cherry picked from commit 54521a2ff93ae06c95c31f79f89dc23c9b51c20b)

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Merge commit c80c09f3e380 from llvm-project (by Dimitry Andric):

[CalcSpillWeights] Avoid x87 excess precision influencing weight result

Fixes #99396

The result of `VirtRegAuxInfo::weightCal

Merge commit c80c09f3e380 from llvm-project (by Dimitry Andric):

[CalcSpillWeights] Avoid x87 excess precision influencing weight result

Fixes #99396

The result of `VirtRegAuxInfo::weightCalcHelper` can be influenced by
x87 excess precision, which can result in slightly different register
choices when the compiler is hosted on x86_64 or i386. This leads to
different object file output when cross-compiling to i386, or native.

Similar to 7af3432e22b0, we need to add a `volatile` qualifier to the
local `Weight` variable to force it onto the stack, and avoid the excess
precision. Define `stack_float_t` in `MathExtras.h` for this purpose,
and use it.

This is the version of the fix for PR276961 that landed upstream.

PR: 276961
Reported by: cperciva
MFC after: 3 days

(cherry picked from commit 1a4b8325f6e3a45c77188343da504fe04495cc46)

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