[Bug other/63426] [meta-bug] Issues found with -fsanitize=undefined

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63426
Bug 63426 depends on bug 61910, which changed state.

Bug 61910 Summary: undefined computation in trans-expr.c gfc_conv_cst_int_power
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61910

           What    |Removed                     |Added
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             Status|WAITING                     |RESOLVED
         Resolution|---                         |FIXED