[Wasm] Convert many of the fixed-size values to LEB128.

src/wasm/encoder.h

Index: src/wasm/encoder.h
diff --git a/src/wasm/encoder.h b/src/wasm/encoder.h
index c765844ae44dfbc5e434595a43cdc75575fcf2b1..b512bd6bc46427be390214baa9218fc9c80ed191 100644
--- a/src/wasm/encoder.h
+++ b/src/wasm/encoder.h
@@ -55,8 +55,9 @@ class WasmFunctionBuilder : public ZoneObject {
                 const uint32_t* local_indices, uint32_t indices_size);
   void Emit(WasmOpcode opcode);
   void EmitWithU8(WasmOpcode opcode, const byte immediate);
-  uint32_t EmitEditableImmediate(const byte immediate);
-  void EditImmediate(uint32_t offset, const byte immediate);
+  void EmitWithVarInt(WasmOpcode opcode, uint32_t immediate);
+  uint32_t EmitEditableVarIntImmediate();
+  void EditVarIntImmediate(uint32_t offset, const uint32_t immediate);
   void Exported(uint8_t flag);
   void External(uint8_t flag);
   void SetName(const unsigned char* name, int name_length);