[PATCH] RISC-V: Fix unordered float compare for Signaling NaN.

[Kito Cheng]

Hi Jim:

This patch is fixing the wrong behavior for unordered float compare
for Signaling NaN, current implementation will suppress the FP
exception flags unconditionally, however signaling NaN should signal
an exception according IEEE 754-2008 spec.

I've add an test for that, and full test is included in glibc/math,
glibc/math testsuite report is attached.

Tested with RV32GC and RV64GC linux gcc and glibc testsuite, no new
failed case introduced.
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