[PATCH] Fix PR 23408

[Andrew Pinski <pinskia at physics dot uc dot edu>]

The problem here is that we call ggc_collect even though we have a 
reference to
a cgraph node in non gc memory after we remove it from the graph.  I 
tried first to
change the array containing the reference to be in GC memory but that 
failed to
bootstrap as we crashed in gc while marking memory.  I decided just to 
remove
the ggc_collect call which fixes the problem.  I am also adding the 
testcase
so if someone adds back a ggc_collect, the testcase will fail.  I did 
not
measure the memory usage because I did not think we created that much
Garbage while doing early inlining.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

	* ipa-inline.c (cgraph_decide_inlining_incrementally): Remove the
	call to ggc_collect.

testsuite/ChangeLog:
	* gcc.dg/pr23408.c: New test.

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