[PATCH] RISC-V: Support the INSN_CLASS.*F.* classes for .insn directive

[Nelson Chu]

Dear binutils,

For the riscv assembler, if we use any floating point register (FPR),
then the f-extension should be set.  Currently we already have the
similar check in the riscv_opcodes table, but the riscv_insn_types
table, which is used to parse the ".insn" directive, have not yet.  It
would be good if the riscv_insn_types table has the same behavior as
the riscv_opcodes table.

Thanks
Best Regards
Nelson
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