Add missing directory

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@39853 91177308-0d34-0410-b5e6-96231b3b80d8

test/Makefile

@@ -1,3 +1,3 @@
 
 all:
-	find CodeGen Lexer Preprocessor Parser \( -name '*.c' -or -name '*.cpp' \) -print -exec ./TestRunner.sh {} \;
+	find CodeGen Lexer Preprocessor Parser Sema \( -name '*.c' -or -name '*.cpp' \) -print -exec ./TestRunner.sh {} \;