Special case -TYPE_MIN_VALUE for flag_wrapv in operator_abs::op1_range.

With flag_wrapv, -TYPE_MIN_VALUE = TYPE_MIN_VALUE which is
unrepresentable.  We currently special case this in the ABS folding
routine, but are missing similar treatment in operator_abs::op1_range.

Tested on x86-64 Linux.

	PR tree-optimization/101938

gcc/ChangeLog:

	* range-op.cc (operator_abs::op1_range): Special case
	-TYPE_MIN_VALUE for flag_wrapv.

gcc/testsuite/ChangeLog:

	* gcc.dg/pr101938.c: New test.