The gcc backend throws an internal error when trying to get the size
of a type which is larger than the amount of address space on the
machine. This patch catches this error and reports it in a user
friendly way.
Fixesgolang/go#11554.
Reviewed-on: https://go-review.googlesource.com/13684
* go-gcc.cc (Gcc_backend::type_size): Return -1 for
unrepresentable size.
From-SVN: r227656
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