AMDGPU: Add builtin for s_dcache_wb

llvm-svn: 339110
diff --git a/clang/lib/Basic/Targets/AMDGPU.cpp b/clang/lib/Basic/Targets/AMDGPU.cpp
index 310c08a..3f147d3d 100644
--- a/clang/lib/Basic/Targets/AMDGPU.cpp
+++ b/clang/lib/Basic/Targets/AMDGPU.cpp
@@ -145,6 +145,7 @@
     case GK_GFX803:
     case GK_GFX802:
     case GK_GFX801:
+      Features["vi-insts"] = true;
       Features["16-bit-insts"] = true;
       Features["dpp"] = true;
       Features["s-memrealtime"] = true;