2015-07-14  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* config/nios2/nios2.c (TEMP_REG_NUM): Move define up in file.
	(nios2_emit_stack_limit_check): Add size parameter.  Handle
	-fstack-limit-symbol as well as -fstack-limit-register.
	(nios2_expand_prologue): Emit only a single stack limit check,
	even if multiple stack adjustments are required.
	(nios2_option_override): Diagnose unsupported combination of -fpic
	and -stack-limit-symbol.

	gcc/testsuite/
	* gcc.target/nios2/nios2-stack-check-1.c: Adjust patterns.
	* gcc.target/nios2/nios2-stack-check-2.c: Likewise.
	* gcc.target/nios2/nios2-stack-check-3.c: New test case.

From-SVN: r225787