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When GDB is built with undefined behavior sanitizer,
gdb.python/py-style.exp fails because of this:
$ ./gdb -q -nx --data-directory=data-directory -ex "python filename_style = gdb.Style('filename')" -ex "python filename_style.intensity = -3"
/home/simark/src/binutils-gdb/gdb/python/py-style.c:239:11: runtime error: load of value 4294967293, which is not a valid value for type 'intensity'
Fix it by casting the value to ui_file_style::intensity only after
validating the raw value.
Change-Id: I38eb471a9cb3bfc3bb8b2c88afa76b8025e4e893