[AMDGPU] Switch to the new addr space mapping by default

This requires corresponding llvm change.

Differential Revision: https://reviews.llvm.org/D40956

llvm-svn: 324102
diff --git a/clang/lib/Basic/Targets/AMDGPU.h b/clang/lib/Basic/Targets/AMDGPU.h
index a4e070f..4fc6ff2 100644
--- a/clang/lib/Basic/Targets/AMDGPU.h
+++ b/clang/lib/Basic/Targets/AMDGPU.h
@@ -77,10 +77,7 @@
     return TT.getArch() == llvm::Triple::amdgcn;
   }
 
-  static bool isGenericZero(const llvm::Triple &TT) {
-    return TT.getEnvironmentName() == "amdgiz" ||
-           TT.getEnvironmentName() == "amdgizcl";
-  }
+  static bool isGenericZero(const llvm::Triple &TT) { return true; }
 
 public:
   AMDGPUTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts);