re PR target/84128 (i686: Stack spilling in -fstack-clash-protection prologue neglect...

re PR target/84128 (i686: Stack spilling in -fstack-clash-protection prologue neglects %esp change)

	PR target/84128
	* config/i386/i386.c (release_scratch_register_on_entry): Add new
	OFFSET and RELEASE_VIA_POP arguments.  Use SP+OFFSET to restore
	the scratch if RELEASE_VIA_POP is false.
	(ix86_adjust_stack_and_probe_stack_clash): Un-constify SIZE.
	If we have to save a temporary register, decrement SIZE appropriately.
	Pass new arguments to release_scratch_register_on_entry.
	(ix86_adjust_stack_and_probe): Likewise.
	(ix86_emit_probe_stack_range): Pass new arguments to
	release_scratch_register_on_entry.

	PR target/84128
	* gcc.target/i386/pr84128.c: New test.

From-SVN: r257303