[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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199621 91177308-0d34-0410-b5e6-96231b3b80d8
[PM] Fix a contradiction in the comments noticed by Anders.

Have I mentioned that functions returning true on error and false on
success are confusing? They're more confusing when their name is
"verify". Anyways...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199622 91177308-0d34-0410-b5e6-96231b3b80d8