[libfuzzer] Roll libFuzzer 2ed967c..4d737af.

third_party/libFuzzer/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("libfuzzer") {
   # libfuzzer should be compiled without coverage (infinite loop in trace_cmp).
   configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
   configs +=
       [ "//build/config/sanitizers:default_sanitizer_flags_but_coverage" ]
   sources = [
     "src/FuzzerCrossOver.cpp",
     "src/FuzzerDriver.cpp",
     "src/FuzzerExtFunctionsDlsym.cpp",
     "src/FuzzerExtFunctionsWeak.cpp",
+    "src/FuzzerExtFunctionsWeakAlias.cpp",
     "src/FuzzerIO.cpp",
+    "src/FuzzerIOPosix.cpp",
+    "src/FuzzerIOWindows.cpp",
     "src/FuzzerLoop.cpp",
     "src/FuzzerMain.cpp",
+    "src/FuzzerMerge.cpp",
     "src/FuzzerMutate.cpp",
     "src/FuzzerSHA1.cpp",
     "src/FuzzerTracePC.cpp",
     "src/FuzzerTraceState.cpp",
     "src/FuzzerUtil.cpp",
     "src/FuzzerUtilDarwin.cpp",
     "src/FuzzerUtilLinux.cpp",
+    "src/FuzzerUtilPosix.cpp",
+    "src/FuzzerUtilWindows.cpp",
   ]
 }
 
 source_set("afl_driver") {
   # AFL should be compiled without coverage (infinite loop in trace_cmp).
   configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
   configs +=
       [ "//build/config/sanitizers:default_sanitizer_flags_but_coverage" ]
 
   sources = [
     "src/afl/afl_driver.cpp",
   ]
 }