[PATCH 3/3][AArch64 nofp] Fix another ICE with +nofp/-mgeneral-regs-only

[Alan Lawrence]

This fixes another ICE, obtained with the attached testcase - yes, there was a 
way to get hold of a float, without passing an argument or going through 
movsf/movdf!

Bootstrapped + check-gcc on aarch64-none-linux-gnu.

gcc/ChangeLog:

	* config/aarch64/aarch64.md (<optab><fcvt_target><GPF:mode>2):
	Condition on TARGET_FLOAT.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/mgeneral-regs_3.c: New.
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