[WebAssembly] Replace SIMD expression types with V128

Summary:
The spec only defines a SIMD expression type of V128 and
leaves interpretation of different vector types to the instructions.

Differential Revision: https://reviews.llvm.org/D50367

Patch by Thomas Lively

llvm-svn: 339082
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
index 70ce40c..2ec595e 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
@@ -253,10 +253,12 @@
   case MVT::i64: retType = WebAssembly::ExprType::I64; break;
   case MVT::f32: retType = WebAssembly::ExprType::F32; break;
   case MVT::f64: retType = WebAssembly::ExprType::F64; break;
-  case MVT::v16i8: retType = WebAssembly::ExprType::I8x16; break;
-  case MVT::v8i16: retType = WebAssembly::ExprType::I16x8; break;
-  case MVT::v4i32: retType = WebAssembly::ExprType::I32x4; break;
-  case MVT::v4f32: retType = WebAssembly::ExprType::F32x4; break;
+  case MVT::v16i8:
+  case MVT::v8i16:
+  case MVT::v4i32:
+  case MVT::v4f32:
+    retType = WebAssembly::ExprType::V128;
+    break;
   case MVT::ExceptRef: retType = WebAssembly::ExprType::ExceptRef; break;
   default: llvm_unreachable("unexpected return type");
   }