Add a test for spaces in SCCs (trac #2036)

testsuite/tests/ghc-regress/profiling/should_fail/Makefile

+TOP=../../../..
+include $(TOP)/mk/boilerplate.mk
+include $(TOP)/mk/test.mk

testsuite/tests/ghc-regress/profiling/should_fail/all.T

+
+test('proffail001', normal, compile_fail, ['-prof -caf-all'])
+

testsuite/tests/ghc-regress/profiling/should_fail/proffail001.hs

+
+module Foo where
+
+wibble :: a
+wibble = {-# SCC "foo bar" #-} wibble
+

testsuite/tests/ghc-regress/profiling/should_fail/proffail001.stderr

+
+proffail001.hs:5:17: Spaces are not allowed in SCCs