[AArch64] Add missing HasNEON predicates to int->float patterns

I was trying to compile code with -march=+nosimd and hit various
instruction predicate verification errors, this patch should address the
ones I saw in integer to floating-pointer conversions.

I noticed that for signed conversions, some non-NEON instruction sequences
are shorter. I don't know if the longer one is still faster on current
architectures (the patterns date back to the initial backend import)

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D125308