Revert r239213: "clang-cl: Implement /GL in terms of -flto."

Reverting until it's easier to use this in a real-world build, e.g.
when the linker can handle it.

llvm-svn: 239656
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index a8d084f..2ead48b 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -1744,7 +1744,7 @@
   // Determine what the derived output name should be.
   const char *NamedOutput;
 
-  if ((JA.getType() == types::TY_Object || JA.getType() == types::TY_LTO_BC) &&
+  if (JA.getType() == types::TY_Object &&
       C.getArgs().hasArg(options::OPT__SLASH_Fo, options::OPT__SLASH_o)) {
     // The /Fo or /o flag decides the object filename.
     StringRef Val = C.getArgs().getLastArg(options::OPT__SLASH_Fo,