Make constant string pointer into an array to remove a pointer lookup for every access.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186482 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index 064e40f..ccaabba 100644
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -93,7 +93,7 @@
                                  SmallVectorImpl<LiveInterval*> &splitLVRs) = 0;
 
   // Use this group name for NamedRegionTimer.
-  static const char *TimerGroupName;
+  static const char TimerGroupName[];
 
 public:
   /// VerifyEnabled - True when -verify-regalloc is given.