[PATCH] Fix the prefix for arm64 triple

[Yi Kong]

Hi t.p.northover, grosbach, rengolin,

Triple.cpp still returns "arm64" as prefix for arm64 triple, causing Clang not being able to select the correct GCCBuiltin IR.

This patch changes the value to correct prefix "aarch64". Regression test will be added in the coming patch.

http://reviews.llvm.org/D4516

Files:
  lib/Support/Triple.cpp

Index: lib/Support/Triple.cpp
===================================================================
--- lib/Support/Triple.cpp
+++ lib/Support/Triple.cpp
@@ -61,17 +61,16 @@
   default:
     return nullptr;
 
+  case arm64:
+  case arm64_be:
   case aarch64:
   case aarch64_be:  return "aarch64";
 
   case arm:
   case armeb:
   case thumb:
   case thumbeb:     return "arm";
 
-  case arm64:       
-  case arm64_be:    return "arm64";
-
   case ppc64:
   case ppc64le:
   case ppc:         return "ppc";
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