Move string pointer from being a static class member to just a static global in the one file its needed in.

llvm-svn: 186476
diff --git a/llvm/lib/Target/R600/AMDGPUMachineFunction.cpp b/llvm/lib/Target/R600/AMDGPUMachineFunction.cpp
index 9a1e344..f2342b0 100644
--- a/llvm/lib/Target/R600/AMDGPUMachineFunction.cpp
+++ b/llvm/lib/Target/R600/AMDGPUMachineFunction.cpp
@@ -2,10 +2,9 @@
 #include "AMDGPU.h"
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/Function.h"
+using namespace llvm;
 
-namespace llvm {
-
-const char *AMDGPUMachineFunction::ShaderTypeAttribute = "ShaderType";
+static const char *const ShaderTypeAttribute = "ShaderType";
 
 AMDGPUMachineFunction::AMDGPUMachineFunction(const MachineFunction &MF) :
     MachineFunctionInfo() {
@@ -21,5 +20,3 @@
       llvm_unreachable("Can't parse shader type!");
   }
 }
-
-}