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/reinclude2.h b/src/third_party/llvm-project/clang/test/PCH/reinclude2.h
new file mode 100644
index 0000000..2aa6d31
--- /dev/null
+++ b/src/third_party/llvm-project/clang/test/PCH/reinclude2.h
@@ -0,0 +1 @@
+int q1 = A::x;