Refactor a bit of duplicated code to useIntegratedAs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177299 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/WindowsToolChain.cpp b/lib/Driver/WindowsToolChain.cpp
index 6d0d328..a0a71a7 100644
--- a/lib/Driver/WindowsToolChain.cpp
+++ b/lib/Driver/WindowsToolChain.cpp
@@ -42,10 +42,6 @@
   else
     Key = JA.getKind();
 
-  bool UseIntegratedAs = C.getArgs().hasFlag(options::OPT_integrated_as,
-                                             options::OPT_no_integrated_as,
-                                             IsIntegratedAssemblerDefault());
-
   Tool *&T = Tools[Key];
   if (!T) {
     switch (Key) {
@@ -61,7 +57,8 @@
     case Action::CompileJobClass:
       T = new tools::Clang(*this); break;
     case Action::AssembleJobClass:
-      if (!UseIntegratedAs && getTriple().getEnvironment() == llvm::Triple::MachO)
+      if (!useIntegratedAs(C.getArgs()) &&
+          getTriple().getEnvironment() == llvm::Triple::MachO)
         T = new tools::darwin::Assemble(*this);
       else
         T = new tools::ClangAs(*this);