Regimplification enhancements 1/3

[Bernd Schmidt]

For the ptx port, I've needed to write a new pass which ensures all 
objects go into address spaces as required by the machine. This uses the 
regimplification code in gimplify-me.c, and that requires some fixes and 
upgrades.

Here's the first. When address spaces change, an ADDR_EXPR may have to 
be changed to ADDR_SPACE_CONVERT_EXPR, and these two have different 
representations in gimple. This patch stops the regimplification code 
from creating invalid gimple in such a case.

Bootstrapped and tested on x86_64-linux, ok?


Bernd
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