[regexp] add fuzzer support for regexp parser and compiler.

test/fuzzer/fuzzer.gyp

Index: test/fuzzer/fuzzer.gyp
diff --git a/test/fuzzer/fuzzer.gyp b/test/fuzzer/fuzzer.gyp
index 38ed563cdac630ada14ec8c94204538547c22ba6..013317b544a7e0b5132c50ae5d0f1c47cadba047 100644
--- a/test/fuzzer/fuzzer.gyp
+++ b/test/fuzzer/fuzzer.gyp
@@ -35,6 +35,32 @@
       ],
     },
     {
+      'target_name': 'regexp_fuzzer',
+      'type': 'executable',
+      'dependencies': [
+        'regexp_fuzzer_lib',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [
+        'fuzzer.cc',
+      ],
+    },
+    {
+      'target_name': 'regexp_fuzzer_lib',
+      'type': 'static_library',
+      'dependencies': [
+        'fuzzer_support',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [  ### gcmole(all) ###
+        'regexp.cc',
+      ],
+    },
+    {
       'target_name': 'fuzzer_support',
       'type': 'static_library',
       'dependencies': [