dont_rewrite_header: Manual "rm -rf %t.checked" for demo purposes

Author: mattmccutchen-cci

clang/test/3C/dont_rewrite_header.c

@@ -1,8 +1,13 @@
+// REVIEW: There should be a way to get "lit" to do this for us.
+// See https://reviews.llvm.org/D34732 (which was immediately reverted because it broke something).
+// RUN: rm -rf %t.checked
+
 // RUN: 3c -base-dir=%S -alltypes -addcr -output-dir=%t.checked %S/dont_rewrite_header.c %S/dont_rewrite_header.h --
 // RUN: FileCheck -match-full-lines -check-prefixes="CHECK" %t.checked/dont_rewrite_header.c --input-file %t.checked/dont_rewrite_header.c
 // RUN: test ! -f %t.checked/dont_rewrite_header.h
+// RUN: cp %S/dont_rewrite_header.h %t.checked/dont_rewrite_header.h
 // RUN: %clang -c -fcheckedc-extension -x c -o /dev/null %t.checked/dont_rewrite_header.c
-// RUN: 3c -base-dir=%t.checked -alltypes -addcr -output-dir=%t.checked2 %t.checked/dont_rewrite_header.c %S/dont_rewrite_header.h --
+// RUN: 3c -base-dir=%t.checked -alltypes -addcr -output-dir=%t.checked2 %t.checked/dont_rewrite_header.c %t.checked/dont_rewrite_header.h --
 // RUN: test ! -f %t.checked2/dont_rewrite_header.h -a ! -f %t.checked2/dont_rewrite_header.c
 
 #include "dont_rewrite_header.h"