PR debug/60655, debug loc expressions

[Jakub Jelinek]

On Thu, Oct 16, 2014 at 05:25:57PM +1030, Alan Modra wrote:
> Ping?
> https://gcc.gnu.org/ml/gcc-patches/2014-09/msg00704.html

I think the simplification should be done when constructing the expressions,
i.e. if possible in the simplification callback or so if it isn't
performed at some level.
Because otherwise, you construct the RTL all the way up into complex
expressions, and then another simplification will, if there are
simplifications e.g. very deep in the expressions, copy the rest all the way
up, creating tons of GC garbage.
So, please find the spot where we forget to simplify stuff, and put the
simplification there.

	Jakub