fixes

Author: mtrofin

llvm/test/lit.cfg.py

@@ -17,8 +17,13 @@
 # name: The name of this test suite.
 config.name = "LLVM"
 
+extra_substitutions = extra_substitutions = ([
+    (r"\| not FileCheck .*", "| tee /dev/null"),
+    (r"\| FileCheck .*", "| tee /dev/null")
+  ] if config.enable_profcheck else [])
+
 # testFormat: The test format to use to interpret tests.
-config.test_format = lit.formats.ShTest(not llvm_config.use_lit_shell)
+config.test_format = lit.formats.ShTest(not llvm_config.use_lit_shell, extra_substitutions)
 
 # suffixes: A list of file extensions to treat as test files. This is overriden
 # by individual lit.local.cfg files in the test subdirectories.