[PATCH] Make disabled-optimization warning more informative; increase default max-gcse-memory

[Bradley Lucier]

This patch (a) removes an exact copy of is_too_expensive from cprop.c, 
(b) renames is_too_expensive in gcse.c to 
gcse_or_cprop_is_too_expensive, (c) expands the warning in 
gcse_or_cprop_is_too_expensive to say how much --param max-gcse-memory 
needs to be increased, and (d) increases the default max-gcse-memory 
from 50MB to 128MB.

The expanded warning allowed me to see how much memory really was needed 
to apply gcse to some of my routines, and 128MB fixes my problem.  The 
limit has been 50MB for over 10 years, I think we can up it a bit now.

Bootstrapped and checked, default languages, no regressions.

Brad

	* gcc/cprop.c (is_too_expensive): Remove.
	(gcse.h): Include.
	(one_cprop_pass): Call gcse_or_cprop_is_too_expensive, not
	is_too_expensive.
	* gcc/gcse.h (gcse_or_cprop_is_too_expensive): Declare.
	* gcc/gcse.c (is_too_expensive): Rename to ...
	(gcse_or_cprop_is_too_expensive): ... this.
	Expand warning to add required size of max-gcse-memory.
	(one_pre_gcse_pass): Use it.
	(one_code_hoisting_pass): Use it.
	* gcc/params.def (max-gcse-memory): Increase from 50MB to 128MB.


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