LoongArch Port: libgcc

2022-03-29  Chenghua Xu  <xuchenghua@loongson.cn>
	    Lulu Cheng  <chenglulu@loongson.cn>

libgcc/ChangeLog:

	* config/loongarch/crtfastmath.c: New file.
	* config/loongarch/linux-unwind.h: Like wise.
	* config/loongarch/sfp-machine.h: Like wise.
	* config/loongarch/t-crtstuff: Like wise.
	* config/loongarch/t-loongarch: Like wise.
	* config/loongarch/t-loongarch64: Like wise.
	* config/loongarch/t-softfp-tf: Like wise.
	* config.host: Add LoongArch tuples.
	* configure.ac: Add LoongArch support.