Use isOSBinFormatMachO() instead of comparing the object format
against an enum.

llvm-svn: 223422
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index d459e4b..99d8443 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -2063,7 +2063,7 @@
         TC = new toolchains::Generic_ELF(*this, Target, Args);
         break;
       }
-      if (Target.getObjectFormat() == llvm::Triple::MachO) {
+      if (Target.isOSBinFormatMachO()) {
         TC = new toolchains::MachO(*this, Target, Args);
         break;
       }