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

third_party/libFuzzer/BUILD.gn

Index: third_party/libFuzzer/BUILD.gn
diff --git a/third_party/libFuzzer/BUILD.gn b/third_party/libFuzzer/BUILD.gn
index 63ea3942ba6deb789f6011ae33e8ea69841a6543..5207a4babf25bb5d3512f6eba805b1865a69ba6d 100644
--- a/third_party/libFuzzer/BUILD.gn
+++ b/third_party/libFuzzer/BUILD.gn
@@ -12,9 +12,13 @@ source_set("libfuzzer") {
     "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",
@@ -22,6 +26,8 @@ source_set("libfuzzer") {
     "src/FuzzerUtil.cpp",
     "src/FuzzerUtilDarwin.cpp",
     "src/FuzzerUtilLinux.cpp",
+    "src/FuzzerUtilPosix.cpp",
+    "src/FuzzerUtilWindows.cpp",
   ]
 }