optimization/6007: cfg cleanup tremendous performance hog with -O1

[David Edelsohn]

>>>>> lucier  writes:

Brad> Right now, neither 3.1 nor 3.2 bootstraps on Solaris.  I don't see how
Brad> I and other people are going to have enough opportunity to test 3.1
Brad> on sparc/Solaris before release to ensure that things work even
Brad> minimally.  (For example, the last time I tried -fprofile-arcs
Brad> -ftest-coverage/gcov, it didn't work.)  Jakub just marked PR 5740
Brad> as fixed, and I haven't had an opportunity to test it, since sparc/Solaris
Brad> hasn't bootstrapped since he sent me the patch privately.

	SPARC Solaris 2.7 is a release criteria for GCC 3.1.  GCC 3.1 will
not be released unless that configuration at least builds and works.

David