[llvm] [AIX] Add git revision to .file string (PR #88164)

[Jake Egan via llvm-commits]

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+; Check that the git revision is contained in the assembly/object files
+
+; RUN: cd %S && git rev-parse HEAD > %t
+
+; RUN: llc < %s > %t.a.o
+; RUN: sed -n -e "/$(cat %t)/p" %t.a.o
+
+; RUN: llc -filetype=obj < %s > %t.b.o
+; RUN: sed -n -e "/$(cat %t)/p" %t.b.o
+
+source_filename = "git_revision.cpp"
+target datalayout = "E-m:a-Fi64-i64:64-n32:64-S128-v256:256:256-v512:512:512"
+target triple = "powerpc64-ibm-aix7.2.0.0"
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jakeegan wrote:

`hasFourStringsDotFile()` only returns true for XCOFF at this time. Other targets can opt in later if they wish.

https://github.com/llvm/llvm-project/pull/88164