Reapply "Driver/Darwin: Time for another spin at switching to the DarwinClang",
now that eprintf symbol issue is resolved.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114166 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/HostInfo.cpp b/lib/Driver/HostInfo.cpp
index 7c5e430..745d273 100644
--- a/lib/Driver/HostInfo.cpp
+++ b/lib/Driver/HostInfo.cpp
@@ -115,6 +115,7 @@
     // If we recognized the arch, match it to the toolchains we support.
     const char *UseNewToolChain = ::getenv("CCC_ENABLE_NEW_DARWIN_TOOLCHAIN");
     if (UseNewToolChain || 
+        Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64 ||
         Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) {
       TC = new toolchains::DarwinClang(*this, TCTriple);
     } else if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {