Make -save-temps=obj play better with -o.

Use only the *dirname* of the pathname given to -o, so that -o can still be used
to name the output executable. This is more like what GCC 4.5 does.

llvm-svn: 74790

llvm/lib/CompilerDriver/Main.cpp

@@ -37,6 +37,7 @@ namespace {
     }
     else if (SaveTemps == SaveTempsEnum::Obj && !OutputFilename.empty()) {
       tempDir = OutputFilename;
+      tempDir = tempDir.getDirname();
 
       if (!tempDir.exists()) {
         std::string ErrMsg;

llvm/lib/CompilerDriver/Tool.cpp

@@ -56,7 +56,7 @@ sys::Path Tool::OutFilename(const sys::Path& In,
   sys::Path Out;
 
   if (StopCompilation) {
-    if (!OutputFilename.empty() && SaveTemps != SaveTempsEnum::Obj ) {
+    if (!OutputFilename.empty()) {
       Out.set(OutputFilename);
     }
     else if (IsJoin()) {