RISC-V: Add Privileged Architecture 1.12 CSRs

RISC-V: Add Privileged Architecture 1.12 CSRs

This commit adds,

* Most of CSRs as listed in the Privileged Architecture,
version 1.12 (except scontext and mscontext).

* Testcases for most CSRs added on the Privileged
Architecture, version 1.12 (except moved "scontext" and
new "mscontext").

include/ChangeLog:

	* opcode/riscv-opc.h (CSR_SENVCFG, CSR_MCONFIGPTR, CSR_MENVCFG,
	CSR_MSTATUSH, CSR_MENVCFGH, CSR_MTINST, CSR_MTVAL2, CSR_MSECCFG,
	CSR_MSECCFGH, CSR_PMPCFG4, CSR_PMPCFG5, CSR_PMPCFG6,
	CSR_PMPCFG7, CSR_PMPCFG8, CSR_PMPCFG9, CSR_PMPCFG10,
	CSR_PMPCFG11, CSR_PMPCFG12, CSR_PMPCFG13, CSR_PMPCFG14,
	CSR_PMPCFG15, CSR_PMPADDR16, CSR_PMPADDR17, CSR_PMPADDR18,
	CSR_PMPADDR19, CSR_PMPADDR20, CSR_PMPADDR21, CSR_PMPADDR22,
	CSR_PMPADDR23, CSR_PMPADDR24, CSR_PMPADDR25, CSR_PMPADDR26,
	CSR_PMPADDR27, CSR_PMPADDR28, CSR_PMPADDR29, CSR_PMPADDR30,
	CSR_PMPADDR31, CSR_PMPADDR32, CSR_PMPADDR33, CSR_PMPADDR34,
	CSR_PMPADDR35, CSR_PMPADDR36, CSR_PMPADDR37, CSR_PMPADDR38,
	CSR_PMPADDR39, CSR_PMPADDR40, CSR_PMPADDR41, CSR_PMPADDR42,
	CSR_PMPADDR43, CSR_PMPADDR44, CSR_PMPADDR45, CSR_PMPADDR46,
	CSR_PMPADDR47, CSR_PMPADDR48, CSR_PMPADDR49, CSR_PMPADDR50,
	CSR_PMPADDR51, CSR_PMPADDR52, CSR_PMPADDR53, CSR_PMPADDR54,
	CSR_PMPADDR55, CSR_PMPADDR56, CSR_PMPADDR57, CSR_PMPADDR58,
	CSR_PMPADDR59, CSR_PMPADDR60, CSR_PMPADDR61, CSR_PMPADDR62,
	CSR_PMPADDR63): New CSR macros.

gas/ChangeLog:

	* testsuite/gas/riscv/csr-dw-regnums.s: Add new CSRs.
	* testsuite/gas/riscv/csr-dw-regnums.d: Likewise.
	* testsuite/gas/riscv/csr.s: Add new CSRs.
	* testsuite/gas/riscv/csr-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p9p1.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p10.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p10.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p11.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p11.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p12.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p12.l: Likewise.