Make max_issue honor issue_rate

[Jie Zhang]

Hi,

This patch is an improvement of the patch I posted before:

http://gcc.gnu.org/ml/gcc/2010-10/msg00278.html

According to the replies to that email, it seems both dropping 
ISSUE_POINTS and making max_issue honor issue_rate are good. So I clean 
it up and resubmit it here for review and approval.

This new patch does not enable "gcc_assert (more_issue >= 0);" since 
it's belongs to another issue and I have sent a patch for that.

I also added a new gcc_assert:

gcc_assert (memcmp (top->state, state, dfa_state_size) != 0);

This is mainly for testing purpose. I will remove it if the test results 
are good.

It's already bootstrapped on x86_64-unknown-linux-gnu. The regression 
testing is going on. Is it OK if no regressions are found?


Regards,
-- 
Jie Zhang
CodeSourcery
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