function.c (stack_protect_epilogue): Use expand_call to expand targetm.stack_protect_...

function.c (stack_protect_epilogue): Use expand_call to expand targetm.stack_protect_fail.

	* function.c (stack_protect_epilogue): Use expand_call to expand
	targetm.stack_protect_fail.
	* stmt.c (expand_expr_stmt): Remove now-unused function.
	* tree.h (expand_expr_stmt): Remove prototype.
	* doc/tm.texi.in (TARGET_STACK_PROTECT_FAIL): Document that this
	hook must return a CALL_EXPR.
	* doc/tm.texi: Regenerate.

From-SVN: r189522