[llvm] [llvm][DebugInfo] Support DW_AT_linkage_names that are different between declaration and definition (PR #154137)

[Rainer Orth via llvm-commits]

rorth wrote:

This patch broke the [Solaris/amd64 buildbot](https://lab.llvm.org/staging/#/builders/120/builds/11933) because it uses `target triple = "arm64-apple-macosx"` without checking that this triple is actually supported (it isn't in builds without `-DLLVM_TARGETS_TO_BUILD=all`).

Please fix.

https://github.com/llvm/llvm-project/pull/154137