[wasm] Write fuzzers for single wasm sections.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index a341e33c6f053711c48b75724997e288f1f06b0d..f89cc567c158938edd1ebfaf6f1f94518018618a 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -1093,6 +1093,18 @@ DEFINE_STRING(redirect_code_traces_to, NULL,
 DEFINE_BOOL(hydrogen_track_positions, false,
             "track source code positions when building IR")
 
+// Parameters for the wasm-section-fuzzer.
+DEFINE_BOOL(wasm_fuzz_types, false, "fuzz the types section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_names, false, "fuzz the names section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_globals, false,
+            "fuzz the globals section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_imports, false,
+            "fuzz the imports section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_function_sigs, false,
+            "fuzz the function signatures section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_memory, false, "fuzz the memory section of a wasm module")
+DEFINE_BOOL(wasm_fuzz_data, false, "fuzz the data section of a wasm module")
+
 //
 // Disassembler only flags
 //