[clang] [llvm] [PowerPC][clang] Fix triple constructor ambiguity causing "unknown" target triple on AIX (PR #147488)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,15 @@
+// Test for the Triple constructor ambiguity fix on AIX
+// This test verifies that the default target triple is correctly resolved
+// and doesn't fall back to "unknown" due to constructor ambiguity.
+
+// REQUIRES: system-aix
+// RUN: %clang -v %s -c 2>&1 | FileCheck %s --check-prefix=CHECK-TARGET
+
+// Test that the target triple contains AIX and is not "unknown"
+// The target should be something like "powerpc-ibm-aix7.3.0.0"
+// CHECK-TARGET: Target: {{.*}}aix{{.*}}
+// CHECK-TARGET-NOT: error: unknown target triple 'unknown'
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arsenm wrote:

```suggestion
```

Negative checks of error messages are far too brittle, just rely on it not erroring? 

https://github.com/llvm/llvm-project/pull/147488