[toplevel patch] Fix PR29544, stage1 not hardcoded to --enable-checking

[Paolo Bonzini]

This was never noticed as toplevel bootstrap was never on a release 
branch so far, so --enable-checking was used for all stages.

We can actually do better with about the same code, and add a 
--enable-stage1-checking flag.  This way you can have a gcac bootstrap 
only for the stage1 compiler (to be used in compilation of stage2); it's 
already slow enough!

Ok for both branch and mainline?

Paolo
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