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

src/wasm/wasm-macro-gen.h

Index: src/wasm/wasm-macro-gen.h
diff --git a/src/wasm/wasm-macro-gen.h b/src/wasm/wasm-macro-gen.h
index beb94316c3297a583a08e257949fcdac9c82307f..4e563e73285c4cebf5933150b07f8686f7b3b44a 100644
--- a/src/wasm/wasm-macro-gen.h
+++ b/src/wasm/wasm-macro-gen.h
@@ -19,6 +19,9 @@
 #define FUNC_INDEX(v) U32V_1(v)
 #define NAME_OFFSET(v) U32_LE(v)
 
+#define ZERO_ALIGNMENT 0
+#define ZERO_OFFSET 0
+
 #define BR_TARGET(v) U32_LE(v)
 
 #define MASK_7 ((1 << 7) - 1)
@@ -325,21 +328,19 @@ class LocalDeclEncoder {
 #define WASM_LOAD_MEM(type, index)                                      \
   static_cast<byte>(                                                    \
       v8::internal::wasm::WasmOpcodes::LoadStoreOpcodeOf(type, false)), \
-      v8::internal::wasm::WasmOpcodes::LoadStoreAccessOf(false), index
+      0, 0, index
 #define WASM_STORE_MEM(type, index, val)                               \
   static_cast<byte>(                                                   \
       v8::internal::wasm::WasmOpcodes::LoadStoreOpcodeOf(type, true)), \
-      v8::internal::wasm::WasmOpcodes::LoadStoreAccessOf(false), index, val
+      0, 0, index, val
 #define WASM_LOAD_MEM_OFFSET(type, offset, index)                       \
   static_cast<byte>(                                                    \
       v8::internal::wasm::WasmOpcodes::LoadStoreOpcodeOf(type, false)), \
-      v8::internal::wasm::WasmOpcodes::LoadStoreAccessOf(true),         \
-      static_cast<byte>(offset), index
+      0, static_cast<byte>(offset), index

[binji, 2016/03/09 18:13:28]

nit: I've been using U32V_1 for values like this, so it's (hopefully) clear that
they could be extended if needed.

[titzer, 2016/03/09 18:49:15]

Done.

 #define WASM_STORE_MEM_OFFSET(type, offset, index, val)                \
   static_cast<byte>(                                                   \
       v8::internal::wasm::WasmOpcodes::LoadStoreOpcodeOf(type, true)), \
-      v8::internal::wasm::WasmOpcodes::LoadStoreAccessOf(true),        \
-      static_cast<byte>(offset), index, val
+      0, static_cast<byte>(offset), index, val
 #define WASM_CALL_FUNCTION(index, ...) \
   kExprCallFunction, static_cast<byte>(index), __VA_ARGS__
 #define WASM_CALL_IMPORT(index, ...) \