[llvm-profdata] Accept --version argument

The `llvm-profdata --version` output now looks like: llvm-profdata LLVM (http://llvm.org/): LLVM version 17.0.0git Optimized build with assertions. This makes llvm-profdata more consistent with other tools. Reviewed By: simon_tatham Differential Revision: https://reviews.llvm.org/D150964
llvm · May 22, 2023 · 6521905 · 6521905
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diff --git a/llvm/test/tools/llvm-profdata/version.test b/llvm/test/tools/llvm-profdata/version.test
@@ -0,0 +1,4 @@
+# RUN: llvm-profdata --version | FileCheck %s
+
+# CHECK: llvm-profdata{{$}}
+# CHECK: LLVM version {{.*}}
diff --git a/llvm/tools/llvm-profdata/llvm-profdata.cpp b/llvm/tools/llvm-profdata/llvm-profdata.cpp
@@ -3070,6 +3070,12 @@ int llvm_profdata_main(int argc, char **argvNonConst,
              << "Available commands: merge, show, overlap\n";
       return 0;
     }
+
+    if (strcmp(argv[1], "--version") == 0) {
+      outs() << ProgName << '\n';
+      cl::PrintVersionMessage();
+      return 0;
+    }
   }
 
   if (argc < 2)