message: Look for FileCheck only if ISPC_INCLUDE_TESTS is specified
diff: @@ -69,12 +69,14 @@ find_program(LLVM_AS_EXECUTABLE NAMES llvm-as
  endif()
  message(STATUS "LLVM_AS_EXECUTABLE: ${LLVM_AS_EXECUTABLE}")
  +if (ISPC_INCLUDE_TESTS)
  find_program(FILE_CHECK_EXECUTABLE NAMES FileCheck
  PATHS ${LLVM_TOOLS_BINARY_DIR} PATH_SUFFIXES bin NO_DEFAULT_PATH)
  if (NOT FILE_CHECK_EXECUTABLE)
  message(FATAL_ERROR "Failed to find FileCheck" )
  endif()
  message(STATUS "FILE_CHECK_EXECUTABLE: ${FILE_CHECK_EXECUTABLE}")
  +endif()
  function(str_to_list inStr outStr)
  string(REPLACE " " ";" tmpOutput "${inStr}")
  