C++ PATCH to improve VLA/EH diagnostics

[Jason Merrill]

VLA types in diagnostics have tended to look like

int[(((sizetype)(((ssizetype)i) + -1)) + 1)]

...which is horrible.  This patch fixes that to

int[i]

and also specifically diagnoses trying to use a variably modified type 
in throw or catch.

Tested x86_64-pc-linux-gnu, applying to trunk.
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