[wasm] Introduce the --print-wasm-code flag to print wasm code.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 73e794583081748f9e80b06551bce39f37b5c0f7..c764b647613fc9e8ba921486aecf0f250a6f181b 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -574,6 +574,8 @@ DEFINE_BOOL(wasm_trap_if, true,
             "enable the use of the trap_if operator for traps")
 DEFINE_BOOL(wasm_code_fuzzer_gen_test, false,
             "Generate a test case when running the wasm-code fuzzer")
+DEFINE_BOOL(print_wasm_code, false, "Print WebAssembly code")
+
 // Profiler flags.
 DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler")
 // 0x1800 fits in the immediate field of an ARM instruction.