[Bug bootstrap/64256] [5.0 Regression] Pointer Bounds Checker builtins enum overflows stabstring length

[zoltan at hidvegi dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64256

--- Comment #7 from Zoltan Hidvegi <zoltan at hidvegi dot com> ---
With the above trivial change I've been able to build code with long
stabstrings on AIX 6.1. I was using the gcc-4.8 branch since that's what we are
using here. If you fix this, could you please also apply it to the gcc-4.8 and
gcc-4.9 branches as well?