[wasm] Encode immediates to Load and Store as varint.

src/wasm/encoder.cc

Index: src/wasm/encoder.cc
diff --git a/src/wasm/encoder.cc b/src/wasm/encoder.cc
index 91624782af8f85350e524dcb7e464a6937621991..b65fc385dfa3fc2802fee7afd259061959e0e6fa 100644
--- a/src/wasm/encoder.cc
+++ b/src/wasm/encoder.cc
@@ -131,6 +131,13 @@ void WasmFunctionBuilder::EmitWithU8(WasmOpcode opcode, const byte immediate) {
   body_.push_back(immediate);
 }
 
+void WasmFunctionBuilder::EmitWithU8U8(WasmOpcode opcode, const byte imm1,
+                                       const byte imm2) {
+  body_.push_back(static_cast<byte>(opcode));
+  body_.push_back(imm1);
+  body_.push_back(imm2);
+}
+
 void WasmFunctionBuilder::EmitWithVarInt(WasmOpcode opcode,
                                          uint32_t immediate) {
   body_.push_back(static_cast<byte>(opcode));