Allow customization for the producer information in the debug output.

llvm-svn: 83659
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 31f74a1..620037c 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -122,7 +122,11 @@
     LangTag = llvm::dwarf::DW_LANG_C89;
   }
 
-  std::string Producer = "clang " CLANG_VERSION_STRING;
+  std::string Producer =
+#ifdef CLANG_VENDOR
+    CLANG_VENDOR
+#endif
+    "clang " CLANG_VERSION_STRING;
   bool isOptimized = LO.Optimize;
   const char *Flags = "";   // FIXME: Encode command line options.