Set incoming stack boundary to 128 for 64-bit targets

Set incoming stack boundary to 128 for 64-bit targets

For 64-bit targets, the incoming stack of interrupt handler is aligned
to 16 bytes.  Update ix86_minimum_incoming_stack_boundary to set the
incoming stack boundary of interrupt handler to 128 for 64-bit targets.

gcc/

2017-03-06  Julia Koval  <julia.koval@intel.com>

	PR target/79793
	* config/i386/i386.c (ix86_minimum_incoming_stack_boundary): Set
	incoming stack boundary to 128 for 64-bit targets.

gcc/testsuite/

2017-03-06  Julia Koval  <julia.koval@intel.com>

	PR target/79793
	 * gcc.target/i386/interrupt-12.c: Update scan-assembler-times
	 directives.
	 * gcc.target/i386/interrupt-13.c: Ditto.
	 * gcc.target/i386/interrupt-14.c: Ditto.
	 * gcc.target/i386/interrupt-15.c: Ditto.

From-SVN: r245926