Revert of 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 37b684755b3dbf44c455905c21f15317e365baeb..124240fad39efaf8bcfc6ac9ad9d405ab1cb1dd1 100644
--- a/src/wasm/wasm-opcodes.h
+++ b/src/wasm/wasm-opcodes.h
@@ -465,16 +465,11 @@
   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.