This series of patches are for fixing PR61441.

This series of patches are for fixing PR61441.

This series of patches are for fixing PR61441. This patch modifies code to use
REAL_VALUE_ISSIGNALING_NAN instead of REAL_VALUE_ISNAN to avoid the operatins
only for sNaN operands.

Bootstrapped & regression-tested on x86_64-linux-gnu.

gcc/
	* fold-const.c (const_binop): Use REAL_VALUE_ISSIGNALING_NAN instead
	of REAL_VALUE_ISNAN to avoid the operation for sNaN operands.
	* simplify-rtx.c (simplify_const_binary_operation): Same.

From-SVN: r231857