[AMDGPU] Supported ds_write_b128 generation.

Summary: This is a follow-on patch of https://reviews.llvm.org/D44210

Author: FarhanaAleen

Reviewed By: msearles

Subscribers: llvm-commits, AMDGPU

Differential Revision: https://reviews.llvm.org/D44319

llvm-svn: 327726
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
index e719933..4d7da21 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
@@ -383,6 +383,9 @@
   (ops node:$val, node:$ptr), (store_local node:$val, node:$ptr)
 >;
 
+def store_align16_local : Aligned16Bytes <
+  (ops node:$val, node:$ptr), (store_local node:$val, node:$ptr)
+>;
 
 def load_flat          : FlatLoad <load>;
 def az_extloadi8_flat  : FlatLoad <az_extloadi8>;