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[basic-improvements] Merge from trunk


The merge tag is gcc-3_4-basic-improvements-merge-20021027.
Bootstrapped i686-linux without Ada - Ada is broken on mainline at
present (the Storage_Error ICE reported elsewhere).

Both mainline and branch are crashing on a variety of test cases at
-O1 and only -O1.  Failures are of the form

20020604-1.c: In function `foo':
20020604-1.c:87: internal compiler error: virtual array reg_n_info[92]: 
 element 92 out of bounds in init_alias_analysis, at alias.c:2814

or

920828-1.c: In function `f':
920828-1.c:1: internal compiler error: Segmentation fault

I may look into this later today, but no promises.

zw


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