Convert SIMD wasm ops to runtime function calls

src/wasm/wasm-opcodes.h

Index: src/wasm/wasm-opcodes.h
diff --git a/src/wasm/wasm-opcodes.h b/src/wasm/wasm-opcodes.h
index b4aaed130c50075d46ee91997d3177ea787a705f..e21bf8e9623996fb93009a750a2714ba9df4e4d7 100644
--- a/src/wasm/wasm-opcodes.h
+++ b/src/wasm/wasm-opcodes.h
@@ -461,11 +461,16 @@ const WasmCodePosition kNoCodePosition = -1;
   V(s_sii, kAstS128, kAstS128, kAstI32, kAstI32)   \
   V(s_si, kAstS128, kAstS128, kAstI32)
 
+#define FOREACH_PREFIX(V) V(Simd, 0xe5)
+
 enum WasmOpcode {
 // Declare expression opcodes.
 #define DECLARE_NAMED_ENUM(name, opcode, sig) kExpr##name = opcode,
   FOREACH_OPCODE(DECLARE_NAMED_ENUM)
 #undef DECLARE_NAMED_ENUM
+#define DECLARE_PREFIX(name, opcode) k##name##Prefix = opcode,
+      FOREACH_PREFIX(DECLARE_PREFIX)
+#undef DECLARE_PREFIX
 };
 
 // The reason for a trap.