[PATCH 1/5] [RISC-V] Recognize Zicond extension

[PATCH 1/5] [RISC-V] Recognize Zicond extension

gcc/ChangeLog:

	* common/config/riscv/riscv-common.cc: New extension.
	* config/riscv/riscv-opts.h (MASK_ZICOND): New mask.
	(TARGET_ZICOND): New target.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/attribute-20.c: New test.
	* gcc.target/riscv/attribute-21.c: New test.

	Co-authored-by: Philipp Tomsich <philipp.tomsich@vrull.eu>