[clang] [Driver][LTO] Copy fix empty stats filename to AIX (PR #71738)

[Qiongsi Wu via cfe-commits]

================
@@ -32,6 +32,14 @@
 // CHECK-LTO: "-o" "obj/dir{{/|\\\\}}save-stats.exe"
 // CHECK-LTO: "-plugin-opt=stats-file=save-stats.stats"
 
+
+// RUN: %clang --target=powerpc-unknown-aix  -save-stats -flto -o obj/dir/save-stats %s -### 2>&1 | FileCheck %s -check-prefix=CHECK-AIX-LTO
+// RUN: %clang --target=powerpc-unknown-aix  -save-stats -flto -o obj/dir/save-stats -Wl,-plugin-opt=-dummy %s -### 2>&1 | FileCheck %s -check-prefix=CHECK-AIX-LTO
----------------
qiongsiwu wrote:

Did we intend to use the AIX linker option convention? 
```suggestion
// RUN: %clang --target=powerpc-unknown-aix  -save-stats -flto -o obj/dir/save-stats -Wl,-bplugin_opt:-dummy %s -### 2>&1 | FileCheck %s -check-prefix=CHECK-AIX-LTO
```

https://github.com/llvm/llvm-project/pull/71738