[PATCH] Reduce garbage produced by tree-ssa-structalias.c

[Daniel Berlin]

Richard Guenther wrote:
> This patch reduces the amount of garbage tree-ssa-structalias.c creates
> (needlessly, if not dumping) by simply not creating it if dumping is
> not in effect.
> 
> This saves 5.5% off the peak memory usage compiling tramp3d-v4 with
> -O --param ggc-min-expand=50 --param ggc-min-heapsize=32000.
> 
> Bootstrapped and tested on x86_64-unknown-linux-gnu.
> 
> Ok for mainline?
> 

This is fine.
:REVIEWMAIL: