re PR middle-end/87138 (wrong code with TI multiplication with -O -march=k8 -fno-tree-fre -mavx512bw)

	PR middle-end/87138
	* expmed.c (expand_mult_const): Use immed_wide_int_const instead of
	gen_int_mode.  Formatting fixes.

	* gcc.target/i386/avx512bw-pr87138.c: New test.

From-SVN: r264009