[llvm] [PowerPC][AIX] Emit PowerPC version for XCOFF. (PR #95510)

[Kai Luo via llvm-commits]

================
@@ -908,6 +908,9 @@ class MCStreamer {
   virtual void emitFileDirective(StringRef Filename, StringRef CompilerVersion,
                                  StringRef TimeStamp, StringRef Description);
 
+  // Emit '.machine "CPU"' assembler diretive.
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bzEq wrote:

```suggestion
  // Emit '.machine <CPU>' assembler diretive.
```

https://github.com/llvm/llvm-project/pull/95510