[llvm] Make clang report garbage target versions. (PR #75373)

[via llvm-commits]

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@@ -1199,7 +1200,11 @@ StringRef Triple::getOSAndEnvironmentName() const {
 
 static VersionTuple parseVersionFromName(StringRef Name) {
   VersionTuple Version;
-  Version.tryParse(Name);
+  if (Version.tryParse(Name)) {
+    errs() << "The input is "<< Name << " and it is invalid. Should pass an "<<
+    "integer or integer combination! e.g. 2, 9.5 or 3.4.5\n";
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enh-google wrote:

maybe better to just go with `"version " << Name << " is invalid"`, rather than try to give examples, since they're so different between Android and iOS/macOS?

https://github.com/llvm/llvm-project/pull/75373