Jim Wilson 4013baf99c RISC-V: Make __divdi3 handle div by zero same as hardware.
The ISA manual specifies that divide by zero always returns -1 as the result.
We were failing to do that when the dividend was negative.

Original patch from Virginie Moser.

	libgcc/
	* config/riscv/div.S (__divdi3): For negative arguments, change bgez
	to bgtz.
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..
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