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

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 85787d9f991ff204bf175a9aa4936e85102f5b4e..beb94316c3297a583a08e257949fcdac9c82307f 100644
--- a/src/wasm/wasm-macro-gen.h
+++ b/src/wasm/wasm-macro-gen.h
@@ -16,9 +16,10 @@
 #define WASM_MODULE_HEADER U32_LE(kWasmMagic), U32_LE(kWasmVersion)
 
 #define SIG_INDEX(v) U16_LE(v)
-#define FUNC_INDEX(v) U16_LE(v)
+#define FUNC_INDEX(v) U32V_1(v)
 #define NAME_OFFSET(v) U32_LE(v)
-#define BR_TARGET(v) U16_LE(v)
+
+#define BR_TARGET(v) U32_LE(v)
 
 #define MASK_7 ((1 << 7) - 1)
 #define MASK_14 ((1 << 14) - 1)
@@ -71,7 +72,7 @@
 #define WASM_UNREACHABLE kExprUnreachable
 
 #define WASM_BR_TABLE(key, count, ...) \
-  kExprBrTable, U16_LE(count), __VA_ARGS__, key
+  kExprBrTable, U32V_1(count), __VA_ARGS__, key
 
 #define WASM_CASE(x) static_cast<byte>(x), static_cast<byte>(x >> 8)
 #define WASM_CASE_BR(x) static_cast<byte>(x), static_cast<byte>(0x80 | (x) >> 8)