Import Cobalt 19.master.0.203780

Includes the following patches:
  https://cobalt-review.googlesource.com/c/cobalt/+/5210
    by errong.leng@samsung.com
  https://cobalt-review.googlesource.com/c/cobalt/+/5270
    by linus.wang@samsung.com
diff --git a/src/third_party/llvm-project/clang/test/PCH/fuzzy-pch.h b/src/third_party/llvm-project/clang/test/PCH/fuzzy-pch.h
new file mode 100644
index 0000000..9eb1005
--- /dev/null
+++ b/src/third_party/llvm-project/clang/test/PCH/fuzzy-pch.h
@@ -0,0 +1,2 @@
+// Header for PCH test fuzzy-pch.c
+void f(int X);