Backport 50ae1c7 ("[LLDB][LoongArch] Fix build errors about NT_LOONGARCH_HW_{BREAK,WATCH}") to LLVM 20

[ziyao233]

Hardware breakpoints support on loongarch64 has been added and available since LLVM 20, but older glibcs and musl 1.2.5 (the latest release) don't ship corresponding macro definition in system headers, which causes building failures of LLDB.

I've checked the patch could be applied to LLVM 20.1.2, fixing the issue.

[ziyao233]

@seehearfeel @DavidSpickett @SixWeining @wangleiat

This is the first time I propose a backport in LLVM-project, sorry for the noise if I don't follow the convention. Thanks for your help!

[DavidSpickett]

https://llvm.org/docs/GitHub.html#backporting-fixes-to-the-release-branches

I think it will work if you follow that where "the issue" is this issue.

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Yao Zi (ziyao233)

Hardware breakpoints support on loongarch64 has been added and available since LLVM 20, but older glibcs and musl 1.2.5 (the latest release) don't ship corresponding macro definition in system headers, which causes building failures of LLDB.

I've checked the patch could be applied to LLVM 20.1.2, fixing the issue.

[ziyao233]

/cherry-pick 50ae1c7

[llvmbot]

/pull-request #134479