ClangTool output cleanup

Information messages sent to stdout by ClangTool now only happen when the
-debug flag is set.

Error messages that used to go to stdout now go to stderr.

Author: Ariel J Bernal <ariel.j.bernal@intel.com>
llvm-svn: 177177
diff --git a/clang/test/Tooling/pch.cpp b/clang/test/Tooling/pch.cpp
index 715c95d..40bc1e9 100644
--- a/clang/test/Tooling/pch.cpp
+++ b/clang/test/Tooling/pch.cpp
@@ -6,12 +6,10 @@
 // RUN: %clang -x c++-header %S/Inputs/pch.h -o %t1
 
 // 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.
-// RUN: clang-check "%S/Inputs/pch.cpp" "%s" -- -include-pch %t1 -I "%S" -c >%t2 2>&1
-// RUN: FileCheck %s < %t2
+// the test file with an unrelated include as second translation unit.
+// Test for an non-empty file after clang-check is executed.
+// RUN: clang-check -ast-dump "%S/Inputs/pch.cpp" "%s" -- -include-pch %t1 -I "%S" -c >%t2 2>&1
+// REQUIRES: shell
+// RUN: test -s %t2
 
 #include "Inputs/pch-fail.h"
-
-// CHECK: Processing