Rename the "sandybridge" subtarget to "corei7-avx", for GCC compatibility.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131730 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Host.cpp b/lib/Support/Host.cpp
index 911c64a..5d1ad92 100644
--- a/lib/Support/Host.cpp
+++ b/lib/Support/Host.cpp
@@ -215,7 +215,7 @@
       case 37: // Intel Core i7, laptop version.
         return "corei7";
       case 42: // SandyBridge
-        return "sandybridge";
+        return "corei7-avx";
 
       case 28: // Intel Atom processor. All processors are manufactured using
                // the 45 nm process