rs6000.c (rs6000_option_override_internal): Display warning message for -mno-speculate-indirect-jumps.

[gcc]

2018-02-06  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_option_override_internal):
	Display warning message for -mno-speculate-indirect-jumps.

[gcc/testsuite]

2018-02-06  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* gcc.target/powerpc/safe-indirect-jump-1.c: Detect deprecation
	warning for -mno-speculate-indirect-jumps.
	* gcc.target/powerpc/safe-indirect-jump-2.c: Likewise.
	* gcc.target/powerpc/safe-indirect-jump-3.c: Likewise.
	* gcc.target/powerpc/safe-indirect-jump-4.c: Likewise.
	* gcc.target/powerpc/safe-indirect-jump-5.c: Likewise.
	* gcc.target/powerpc/safe-indirect-jump-6.c: Likewise.
	* gcc.target/powerpc/safe-indirect-jump-7.c: Likewise.

From-SVN: r257419