Revert "[clang] Add getClangVendor() and use it in CodeGenModule.cpp (#75935)"

This reverts commit 9055519, due to an
incorrectly chosen commit message.

Author: DimitryAndric

clang/include/clang/Basic/Version.h

@@ -40,9 +40,6 @@ namespace clang {
   /// string as getClangRevision.
   std::string getLLVMRevision();
 
-  /// Retrieves the Clang vendor tag.
-  std::string getClangVendor();
-
   /// Retrieves the full repository version that is an amalgamation of
   /// the information in getClangRepositoryPath() and getClangRevision().
   std::string getClangFullRepositoryVersion();

clang/lib/Basic/Version.cpp

@@ -57,14 +57,6 @@ std::string getLLVMRevision() {
 #endif
 }
 
-std::string getClangVendor() {
-#ifdef CLANG_VENDOR
-  return CLANG_VENDOR;
-#else
-  return "";
-#endif
-}
-
 std::string getClangFullRepositoryVersion() {
   std::string buf;
   llvm::raw_string_ostream OS(buf);
@@ -100,7 +92,10 @@ std::string getClangFullVersion() {
 std::string getClangToolFullVersion(StringRef ToolName) {
   std::string buf;
   llvm::raw_string_ostream OS(buf);
-  OS << getClangVendor() << ToolName << " version " CLANG_VERSION_STRING;
+#ifdef CLANG_VENDOR
+  OS << CLANG_VENDOR;
+#endif
+  OS << ToolName << " version " CLANG_VERSION_STRING;
 
   std::string repo = getClangFullRepositoryVersion();
   if (!repo.empty()) {
@@ -115,7 +110,10 @@ std::string getClangFullCPPVersion() {
   // the one we report on the command line.
   std::string buf;
   llvm::raw_string_ostream OS(buf);
-  OS << getClangVendor() << "Clang " CLANG_VERSION_STRING;
+#ifdef CLANG_VENDOR
+  OS << CLANG_VENDOR;
+#endif
+  OS << "Clang " CLANG_VERSION_STRING;
 
   std::string repo = getClangFullRepositoryVersion();
   if (!repo.empty()) {

clang/lib/CodeGen/CodeGenModule.cpp

@@ -995,7 +995,12 @@ void CodeGenModule::Release() {
                               uint32_t(CLANG_VERSION_MINOR));
     getModule().addModuleFlag(llvm::Module::Warning, "zos_product_patchlevel",
                               uint32_t(CLANG_VERSION_PATCHLEVEL));
-    std::string ProductId = getClangVendor() + "clang";
+    std::string ProductId;
+#ifdef CLANG_VENDOR
+    ProductId = #CLANG_VENDOR;
+#else
+    ProductId = "clang";
+#endif
     getModule().addModuleFlag(llvm::Module::Error, "zos_product_id",
                               llvm::MDString::get(VMContext, ProductId));