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

test/unittests/wasm/wasm-macro-gen-unittest.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/unittests/test-utils.h"
 
 #include "src/wasm/wasm-macro-gen.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 75 matching lines @@
 TEST_F(WasmMacroGenTest, MacroStatements) {
   EXPECT_SIZE(8, WASM_WHILE(WASM_I8(0), WASM_NOP));
   EXPECT_SIZE(7, WASM_INC_LOCAL(0));
   EXPECT_SIZE(7, WASM_INC_LOCAL_BY(0, 3));
 
   EXPECT_SIZE(3, WASM_BREAK(0));
   EXPECT_SIZE(3, WASM_CONTINUE(0));
 }
 
 TEST_F(WasmMacroGenTest, BrTable) {
-  EXPECT_SIZE(7, WASM_BR_TABLE(WASM_ZERO, 1, BR_TARGET(1)));
+  EXPECT_SIZE(8, WASM_BR_TABLE(WASM_ZERO, 1, BR_TARGET(1)));
 }
 
 
 TEST_F(WasmMacroGenTest, Expressions) {
   EXPECT_SIZE(2, WASM_GET_LOCAL(0));
   EXPECT_SIZE(2, WASM_GET_LOCAL(1));
   EXPECT_SIZE(2, WASM_GET_LOCAL(12));
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(0));
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(1));
   EXPECT_SIZE(2, WASM_LOAD_GLOBAL(12));
@@ skipping 208 matching lines @@
     EXPECT_SIZE(5, WASM_LOAD_MEM_OFFSET(kMemTypes[i], 11, WASM_ZERO));
   }
   for (size_t i = 0; i < arraysize(kMemTypes); i++) {
     EXPECT_SIZE(7, WASM_STORE_MEM_OFFSET(kMemTypes[i], 13, WASM_ZERO,
                                          WASM_GET_LOCAL(0)));
   }
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8