Re-work RISC-V gas flags: now we just support -mabi and -march

We've decided to standardize on two flags for RISC-V: "-march" sets the
target architecture (which determines which instructions can be
generated), and "-mabi" sets the target ABI.  We needed to rework this
because the old flag set didn't support soft-float or single-float ABIs,
and didn't support an x32-style ABI on RISC-V.

Additionally, we've changed the behavior of the -march flag: it's now a
lot stricter and only parses things we can actually understand.
Additionally, it's now lowercase-only: the rationale is that while the
RISC-V ISA manual specifies that ISA strings are case-insensitive, in
Linux-land things are usually case-sensitive.  Since this flag can be
used to determine library paths, we didn't want to bake some
case-insensitivity in there that would case trouble later.

This patch implements these two new flags and removes the old flags that
could conflict with these.  There wasn't a RISC-V release before, so we
want to just support a clean flag set.

include/
	* elf/riscv.h (EF_RISCV_SOFT_FLOAT): Don't define.
	(EF_RISCV_FLOAT_ABI, EF_RISCV_FLOAT_ABI_SOFT): Define.
	(EF_RISCV_FLOAT_ABI_SINGLE, EF_RISCV_FLOAT_ABI_DOUBLE): Define.
	(EF_RISCV_FLOAT_ABI_QUAD): Define.
bfd/
	* elfnn-riscv.c (_bfd_riscv_elf_merge_private_bfd_data): Use
	EF_RISCV_FLOAT_ABI_SOFT instead of EF_RISCV_SOFT_FLOAT.
binutils/
	* readelf.c (get_machine_flags): Use
	EF_RISCV_FLOAT_ABI_{SOFT,SINGLE,DOBULE,QUAD) instead of
	EF_RISCV_{SOFT,HARD}_FLOAT.
gas/
	* config/tc-riscv.h (xlen): Delete.
	* config/tc-riscv.c (xlen): Make static.
	(abi_xlen): New variable.
	(options): Replace OPTION_{M32,M64,MSOFT_FLOAT,MHARD_FLOAT,MRVC}
	with OPTION_MABI.
	(md_longopts): Likewise.
	(md_parse_option): Likewise.
	(riscv_elf_final_processing): Likewise.
	* doc/as.texinfo (Target RISC-V options): Likewise.
	* doc/c-riscv.texi (OPTIONS): Likewise.
	* config/tc-riscv.c (float_mode): Removed.
	(float_abi): New type, specifies the floating-point ABI.
	(riscv_set_abi): New function.
	(riscv_add_subset): Only allow lower-case ISA names and require
	them to start with "rv".
	(riscv_after_parse_args): Likewise.
opcodes/
	* riscv-dis.c (riscv_disassemble_insn): Default to the ELF's
	XLEN when none is provided.

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