[PATCH 0/2] Correct the requirement of compressed floating point instructions.

[Kito Cheng]

This series patches are contain 2 patches, main purpose is correct the
requirement of compressed floating point load/store instructions.

In current implementation, -march=rv32ic and -march=rv64ic can accept
fld without warning, because gas only check C extension is available.

So I've make it able to check more than one extension in first patch,
and fix those info for compressed floating point load/store
instructions.