[PATCH, GAS/ARM] Allow immediate without prefix in unified syntax for VCMP

[Thomas Preudhomme]

Hi,

Instruction Set Syntax section in GNU as documentation for ARM says
about the unified syntax that "immediate operands do not require a #
prefix". However, vcmp.f32 s0, 0.0 currently fails to assemble. This is
because the parse_ifimm_zero function is used to parse the immediate and
this function expects an immediate prefix unconditionally.

This patch change the logic to only fail in the absence of a prefix if
not in unified syntax and only skip the prefix if one was found.

ChangeLog entry is as follows:

*** gas/ChangeLog ***

2017-02-02  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         * config/tc-arm.c (parse_ifimm_zero): Make prefix optional in unified
         syntax.
         * testsuite/gas/arm/vcmp-noprefix-imm.d: New file.
         * testsuite/gas/arm/vcmp-noprefix-imm.s: New file.


Testing: after the patch the example assembles fine and the testsuite
shows no regression.

Is this ok for master?

Best regards,

Thomas
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