Fix typo.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161106 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Tooling/pch.cpp b/test/Tooling/pch.cpp
index 387aeb5..715c95d 100644
--- a/test/Tooling/pch.cpp
+++ b/test/Tooling/pch.cpp
@@ -5,7 +5,7 @@
// a stat cache into the FileManager:
// RUN: %clang -x c++-header %S/Inputs/pch.h -o %t1
-// Use the generated pch and enforce a subsequent stat miss by by using
+// Use the generated pch and enforce a subsequent stat miss by using
// the test file with an unrelated include as second translation unit:
// Do not directly pipe into FileCheck, as that would hide errors from
// valgrind due to pipefail not being set in lit.
