X86: Rename the CLMUL target feature to PCLMUL.

It was renamed in gcc/gas a while ago and causes all kinds of
confusion because it was named differently in llvm and clang.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157745 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 3e00f50..962364b 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -202,8 +202,8 @@
   bool IsAMD   = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0;
 
   if ((ECX >> 1) & 0x1) {
-    HasCLMUL = true;
-    ToggleFeature(X86::FeatureCLMUL);
+    HasPCLMUL = true;
+    ToggleFeature(X86::FeaturePCLMUL);
   }
   // FMA3 autodetection is switched off until we have a special flag
   // in code generator
@@ -328,7 +328,7 @@
   , HasPOPCNT(false)
   , HasSSE4A(false)
   , HasAES(false)
-  , HasCLMUL(false)
+  , HasPCLMUL(false)
   , HasFMA3(false)
   , HasFMA4(false)
   , HasXOP(false)