[committed] RISC-V testsuite changes to test clmul expansion of CRCs

[committed] RISC-V testsuite changes to test clmul expansion of CRCs

This testsuite only patch allows us to test code generation for CRC functions
using clmul instructions.

Conceptually it's trivial.  We already have various execution tests in
gcc.dg/torture.  We just define a new set of dg directives and include the
testcase in gcc.dg/torture.

The only gotcha in here is the need to change target-supports.exp.  It was
passing the default set of arguments down to the check_runtime routine, so they
always failed to assemble the testcase and we never claimed the ability to
execute Zbc, Zbkb or Zbkc extension code.

Again, NFC, just testsuite bits.  Pushing to the trunk.

Only aarch64 and x86 bits left ;-)

gcc/testsuite
	* gcc.target/riscv/crc-1-zbc.c: New test.
	* gcc.target/riscv/crc-1-zbkc.c: Likewise.
	* gcc.target/riscv/crc-10-zbc.c: Likewise.
	* gcc.target/riscv/crc-10-zbkc.c: Likewise.
	* gcc.target/riscv/crc-12-zbc.c: Likewise.
	* gcc.target/riscv/crc-12-zbkc.c: Likewise.
	* gcc.target/riscv/crc-13-zbc.c: Likewise.
	* gcc.target/riscv/crc-13-zbkc.c: Likewise.
	* gcc.target/riscv/crc-14-zbc.c: Likewise.
	* gcc.target/riscv/crc-14-zbkc.c: Likewise.
	* gcc.target/riscv/crc-17-zbc.c: Likewise.
	* gcc.target/riscv/crc-17-zbkc.c: Likewise.
	* gcc.target/riscv/crc-18-zbc.c: Likewise.
	* gcc.target/riscv/crc-18-zbkc.c: Likewise.
	* gcc.target/riscv/crc-21-rv64-zbc.c: Likewise.
	* gcc.target/riscv/crc-21-rv64-zbkc.c: Likewise.
	* gcc.target/riscv/crc-22-zbc.c: Likewise.
	* gcc.target/riscv/crc-22-zbkc.c: Likewise.
	* gcc.target/riscv/crc-23-zbc.c: Likewise.
	* gcc.target/riscv/crc-23-zbkc.c: Likewise.
	* gcc.target/riscv/crc-4-zbc.c: Likewise.
	* gcc.target/riscv/crc-4-zbkb.c: Likewise.
	* gcc.target/riscv/crc-4-zbkc.c: Likewise.
	* gcc.target/riscv/crc-5-zbc.c: Likewise.
	* gcc.target/riscv/crc-5-zbkb.c: Likewise.
	* gcc.target/riscv/crc-5-zbkc.c: Likewise.
	* gcc.target/riscv/crc-6-zbc.c: Likewise.
	* gcc.target/riscv/crc-6-zbkc.c: Likewise.
	* gcc.target/riscv/crc-7-zbc.c: Likewise.
	* gcc.target/riscv/crc-7-zbkc.c: Likewise.
	* gcc.target/riscv/crc-8-zbc.c: Likewise.
	* gcc.target/riscv/crc-8-zbkc.c: Likewise.
	* gcc.target/riscv/crc-9-zbc.c: Likewise.
	* gcc.target/riscv/crc-9-zbkc.c: Likewise.
	* gcc.target/riscv/crc-CCIT-data16-zbc.c: Likewise.
	* gcc.target/riscv/crc-CCIT-data16-zbkc.c: Likewise.
	* gcc.target/riscv/crc-CCIT-data8-zbc.c: Likewise.
	* gcc.target/riscv/crc-CCIT-data8-zbkc.c: Likewise.
	* gcc.target/riscv/crc-coremark-16bitdata-zbc.c: Likewise.
	* gcc.target/riscv/crc-coremark-16bitdata-zbkc.c: Likewise.
	* lib/target-supports.exp (check_effective_target_riscv_zbc_ok): Set
	gcc_march before compiling test program.
	(check_effective_target_riscv_zbkc_ok): Likewise.
	(check_effective_target_riscv_zbkb_ok): Likewise.
	Co-authored-by: Jeff Law <jlaw@ventanamicro.com>