Rename Darwin_X86 toolchain to just Darwin, this can support all platforms.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81016 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/HostInfo.cpp b/lib/Driver/HostInfo.cpp
index 1b64212..89a3f8f 100644
--- a/lib/Driver/HostInfo.cpp
+++ b/lib/Driver/HostInfo.cpp
@@ -157,9 +157,9 @@
     TCTriple.setArchName(ArchName);
                           
     if (strcmp(ArchName, "i386") == 0 || strcmp(ArchName, "x86_64") == 0)
-      TC = new toolchains::Darwin_X86(*this, TCTriple,
-                                      DarwinVersion,
-                                      GCCVersion);
+      TC = new toolchains::Darwin(*this, TCTriple,
+                                  DarwinVersion,
+                                  GCCVersion);
     else
       TC = new toolchains::Darwin_GCC(*this, TCTriple);
   }