[Patch libgcc AArch64 12/17] Enable hfmode soft-float conversions and truncations

[Patch libgcc AArch64 12/17] Enable hfmode soft-float conversions and truncations

gcc/

	* config/aarch64/aarch64-c.c (aarch64_scalar_mode_supported_p): New.
	(TARGET_SCALAR_MODE_SUPPORTED_P): Define.

libgcc/

	* config/aarch64/sfp-machine.h (_FP_NANFRAC_H): Define.
	(_FP_NANSIGN_H): Likewise.
	* config/aarch64/t-softfp (softfp_extensions): Add hftf.
	(softfp_truncations): Add tfhf.
	(softfp_extras): Add required conversion functions.

From-SVN: r242844