AMDGPU: Handle gfx909 in AMDGPUTargetInfo::initFeatureMap

+ add required tests

llvm-svn: 345181
diff --git a/clang/lib/Basic/Targets/AMDGPU.cpp b/clang/lib/Basic/Targets/AMDGPU.cpp
index fd267eb..3851cda 100644
--- a/clang/lib/Basic/Targets/AMDGPU.cpp
+++ b/clang/lib/Basic/Targets/AMDGPU.cpp
@@ -138,6 +138,7 @@
     case GK_GFX906:
       Features["dl-insts"] = true;
       LLVM_FALLTHROUGH;
+    case GK_GFX909:
     case GK_GFX904:
     case GK_GFX902:
     case GK_GFX900: