AMDGPU/SI: Add d16 support for buffer intrinsics.

Differential Revision:
  https://reviews.llvm.org/D38906

Reviewers:
  Matt and Brian.

llvm-svn: 322402
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp
index 8156599..9b9ec06 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp
@@ -61,7 +61,8 @@
   VI = 1,
   SDWA = 2,
   SDWA9 = 3,
-  GFX9 = 4
+  GFX80 = 4,
+  GFX9 = 5
 };
 
 static SIEncodingFamily subtargetEncodingFamily(const AMDGPUSubtarget &ST) {