[wasm] Do not support grow_memory for asmjs modules.

src/wasm/wasm-opcodes.cc

Index: src/wasm/wasm-opcodes.cc
diff --git a/src/wasm/wasm-opcodes.cc b/src/wasm/wasm-opcodes.cc
index f776da6aef3e768c6073f1e32ef4fd3dadcdfa45..cd2dde47480c9a6323006e361d3bb6af89990b6b 100644
--- a/src/wasm/wasm-opcodes.cc
+++ b/src/wasm/wasm-opcodes.cc
@@ -86,6 +86,7 @@ static const FunctionSig* kSimdExprSigs[] = {
     nullptr, FOREACH_SIMD_SIGNATURE(DECLARE_SIMD_SIG_ENTRY)};
 
 static byte kSimpleExprSigTable[256];
+static byte kSimpleAsmjsExprSigTable[256];
 static byte kSimdExprSigTable[256];
 
 // Initialize the signature table.
@@ -93,9 +94,11 @@ static void InitSigTables() {
 #define SET_SIG_TABLE(name, opcode, sig) \
   kSimpleExprSigTable[opcode] = static_cast<int>(kSigEnum_##sig) + 1;
   FOREACH_SIMPLE_OPCODE(SET_SIG_TABLE);
-  FOREACH_SIMPLE_MEM_OPCODE(SET_SIG_TABLE);
-  FOREACH_ASMJS_COMPAT_OPCODE(SET_SIG_TABLE);
 #undef SET_SIG_TABLE
+#define SET_ASMJS_SIG_TABLE(name, opcode, sig) \
+  kSimpleAsmjsExprSigTable[opcode] = static_cast<int>(kSigEnum_##sig) + 1;
+  FOREACH_ASMJS_COMPAT_OPCODE(SET_ASMJS_SIG_TABLE);
+#undef SET_ASMJS_SIG_TABLE
   byte simd_index;
 #define SET_SIG_TABLE(name, opcode, sig) \
   simd_index = opcode & 0xff;            \
@@ -114,6 +117,10 @@ class SigTable {
     return const_cast<FunctionSig*>(
         kSimpleExprSigs[kSimpleExprSigTable[static_cast<byte>(opcode)]]);
   }
+  FunctionSig* AsmjsSignature(WasmOpcode opcode) const {
+    return const_cast<FunctionSig*>(
+        kSimpleExprSigs[kSimpleAsmjsExprSigTable[static_cast<byte>(opcode)]]);
+  }
   FunctionSig* SimdSignature(WasmOpcode opcode) const {
     return const_cast<FunctionSig*>(
         kSimdExprSigs[kSimdExprSigTable[static_cast<byte>(opcode & 0xff)]]);
@@ -130,6 +137,10 @@ FunctionSig* WasmOpcodes::Signature(WasmOpcode opcode) {
   }
 }
 
+FunctionSig* WasmOpcodes::AsmjsSignature(WasmOpcode opcode) {
+  return sig_table.Get().AsmjsSignature(opcode);
+}
+
 // TODO(titzer): pull WASM_64 up to a common header.
 #if !V8_TARGET_ARCH_32_BIT || V8_TARGET_ARCH_X64
 #define WASM_64 1