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Re: mainline "exploding"

Here is some data for testcase from PR8361:

	  	-O0 	-O1	-O2	-O3
----------------------------------------------
GCC 3.2.3 	28.98	54.27	70.90	73.9
GCC 3.3.2 	30.13	54.59	76.39	77.89
mainline  	31.91	113.22	105.29	106.30
 w/o checking   26.37   90.78   87.88   89.16
tree-ssa        32.60   71.49   93.78   99.14

Mainline (w/o checking) is nearly twice as slow as 3.3.2 for -O1.

Gerald
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