[clang] [llvm] [PowerPC][ISelLowering] Support -mstack-protector-guard=tls (PR #110928)

[Stewart Smith via cfe-commits]

stewartsmith wrote:

It's been a few years (and I've spent more time in 16bit x86 than powerpc for a 
while), but I'm pretty sure this looks good.

While the POWER ISA may be lacking vowels, the lack of `r` denoting registers 
in the test llvm test suite is (at least for me) doing it on hard mode :)

https://github.com/llvm/llvm-project/pull/110928
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[clang] [Clang][Driver][AArch64] Add support for aarch64-amazon-linux triple (PR #109263)

[Stewart Smith via cfe-commits]

stewartsmith wrote:

For context and history on Amazon Linux and triplets:

Amazon Linux 1 (otherwise known as Amazon Linux AMI / al-ami) is (was?) the now 
End-of-Life first Amazon Linux version. It was only ever built for x86 and 
x86-64, and used the $ARCH-amazon-linux triplet.

The [last 32bit AMI being part of the 2014.09 
release](https://aws.amazon.com/amazon-linux-ami/2014.09-release-notes/), which 
means it's been close to a decade now of booting 32bit not being supported in 
AL. Runtime support for 32-bit continued however, until EoL.

Amazon Linux 2 (released 2018, still supported) was the first to add `aarch64` 
(on top of `x86-64`). It still had some `i686` runtime support, but didn't ship 
devel packages. The compiler triplet was `$ARCH-redhat-linux-gcc` (for gcc), 
reflecting its closer lineage.

The current release, [Amazon Linux 2023, is back to using the `-amazon-linux` 
part](https://docs.aws.amazon.com/linux/al2023/ug/compare-with-al2.html#compiler-triplet).

tl;dr: AL2 has `-redhat-linux-` in the triplet, and AL2023 goes back to having 
`-amazon-linux-` like AL1 had.

I've attached the patch we carry in `clang` on AL2023 so we get all the right 
triplets, which is effectively what the PR here does (albeit adding `i686` as 
well, as we only dropped 32-bit builds later in the AL2023 development cycle). 
Apologies for not sending this upstream at the time - certainly my bad there.

Going forward, I can't see any future version of Amazon Linux changing away 
from `-amazon-linux-` in the triplet.

[0003-Add-Amazon-Linux-vendor-triplets-to-set-of-GNU-toolc.patch](https://github.com/user-attachments/files/17216212/0003-Add-Amazon-Linux-vendor-triplets-to-set-of-GNU-toolc.patch)

For the tests being added here, if covering the (EoL) AL1 is desired, then 
that'd be separate from what covering AL2023 would be.


https://github.com/llvm/llvm-project/pull/109263
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