[build] Have one build target for all v8 fuzzers.

R=machenbach@chromium.org, ahaas@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2632493002
Cr-Commit-Position: refs/heads/master@{#42310}

BUILD.gn

@@ -2504,14 +2504,10 @@ group("gn_all") {
 
   deps = [
     ":d8",
+    ":v8_fuzzers",
     ":v8_hello_world",
     ":v8_parser_shell",
     ":v8_sample_process",
-    ":v8_simple_json_fuzzer",
-    ":v8_simple_parser_fuzzer",
-    ":v8_simple_regexp_fuzzer",
-    ":v8_simple_wasm_asmjs_fuzzer",
-    ":v8_simple_wasm_fuzzer",
     "test:gn_all",
     "tools:gn_all",
   ]
@@ -2525,6 +2521,26 @@ group("gn_all") {
   }
 }
 
+group("v8_fuzzers") {
+  testonly = true
+  deps = [
+    ":v8_simple_json_fuzzer",
+    ":v8_simple_parser_fuzzer",
+    ":v8_simple_regexp_fuzzer",
+    ":v8_simple_wasm_asmjs_fuzzer",
+    ":v8_simple_wasm_call_fuzzer",
+    ":v8_simple_wasm_code_fuzzer",
+    ":v8_simple_wasm_data_section_fuzzer",
+    ":v8_simple_wasm_function_sigs_section_fuzzer",
+    ":v8_simple_wasm_fuzzer",
+    ":v8_simple_wasm_globals_section_fuzzer",
+    ":v8_simple_wasm_imports_section_fuzzer",
+    ":v8_simple_wasm_memory_section_fuzzer",
+    ":v8_simple_wasm_names_section_fuzzer",
+    ":v8_simple_wasm_types_section_fuzzer",
+  ]
+}
+
 if (is_component_build) {
   v8_component("v8") {
     sources = [