[RFC] Unconditionally clean up CFG before emitting prologue

[Eric Botcazou]

Hi,

with the numerous checks generated in Ada, the gimplification process can 
generated dead branches that aren't easily eliminated at -O0 and can impair 
the debugging experience.  We have found that unconditionally cleaning up the 
CFG before emitting the prologue/epilogue can help in some cases.  This is the 
same idiom already used in rest_of_handle_jump2 for example.

Tested on x86_64-suse-linux.  Comments?


2012-04-09  Eric Botcazou  <ebotcazou@adacore.com>

	* function.c (rest_of_handle_thread_prologue_and_epilogue): Clean up
	the CFG before generating prologue/epilogue even when not optimizing.


-- 
Eric Botcazou
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