Shorten the output of clang-format --version, include revision number.

Before:
  $ clang-format  --version
  LLVM (http://llvm.org/):
    LLVM version 3.5svn
    Optimized build with assertions.
    Built Jan  3 2014 (14:28:46).
    Default target: x86_64-apple-darwin13.0.0
    Host CPU: core-avx-i

Now:
  $ bin/clang-format --version
  clang-format version 3.5 (198452)

llvm-svn: 198694

clang/lib/Basic/Version.cpp

@@ -116,12 +116,16 @@ std::string getClangFullRepositoryVersion() {
 }
 
 std::string getClangFullVersion() {
+  return getClangToolFullVersion("clang");
+}
+
+std::string getClangToolFullVersion(StringRef ToolName) {
   std::string buf;
   llvm::raw_string_ostream OS(buf);
 #ifdef CLANG_VENDOR
   OS << CLANG_VENDOR;
 #endif
-  OS << "clang version " CLANG_VERSION_STRING " "
+  OS << ToolName << " version " CLANG_VERSION_STRING " "
      << getClangFullRepositoryVersion();
 
   // If vendor supplied, include the base LLVM version as well.