[AArch64 NEON] Accept both #0.0 and #0 for comparing with floating point zero in asm parser.

For FCMEQ, FCMGE, FCMGT, FCMLE and FCMLT, floating point zero will be
printed as #0.0 instead of #0. To support the history codes using #0,
we consider to let asm parser accept both #0.0 and #0.