[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/MCTargetDesc/WebAssemblyMCTargetDesc.h b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
index 071e458..b4639b4 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
@@ -312,18 +312,12 @@
 
 /// This is used to indicate block signatures.
 enum class ExprType : unsigned {
-  Void      = 0x40,
-  I32       = 0x7F,
-  I64       = 0x7E,
-  F32       = 0x7D,
-  F64       = 0x7C,
-  I8x16     = 0x7B,
-  I16x8     = 0x7A,
-  I32x4     = 0x79,
-  F32x4     = 0x78,
-  B8x16     = 0x77,
-  B16x8     = 0x76,
-  B32x4     = 0x75,
+  Void = 0x40,
+  I32 = 0x7F,
+  I64 = 0x7E,
+  F32 = 0x7D,
+  F64 = 0x7C,
+  V128 = 0x7B,
   ExceptRef = 0x68
 };