[FileCheck] Add missing include in FileCheckImpl.h

FileCheckImpl.h internal header uses type defined in the public
FileCheck.h header but fails to include it. This commit fixes that.

Test Plan: Built it locally successfully.

diff --git a/llvm/lib/Support/FileCheckImpl.h b/llvm/lib/Support/FileCheckImpl.h
index a75530c..2620e9e 100644 (file)
--- a/llvm/lib/Support/FileCheckImpl.h
+++ b/llvm/lib/Support/FileCheckImpl.h
@@ -15,6 +15,7 @@
 #ifndef LLVM_LIB_SUPPORT_FILECHECKIMPL_H
 #define LLVM_LIB_SUPPORT_FILECHECKIMPL_H
 
+#include "llvm/Support/FileCheck.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"