CSKYDisassembler tries to disassemble register MC operand from register num for different register class, and
also handles immediate num and carry flag operand which is not encoded in instruction binary.
Also enhance the printer of instruction to accept sub-option to control the print format. Sometimes, it prefers to
print number in hex, especially when immediate number represents symbol address.
CSKY arch has multiple FPU instruction versions such as FPU, FPUv2 and FPUv3 to implement floating operations.
For now, we just only support FPUv2 and FPUv3.
It includes the encoding, asm parsing of instructions and codegen of DAG nodes.
Complete the basic integer instruction set and add related predictor in CSKY.td.
And it includes the instruction definition and asm parser support.
Differential Revision: https://reviews.llvm.org/D111701
This basic parser will handle basic instructions with register or immediate operands.
With the addition of CSKYInstPrinter, we can now make use of lit tests.
Differential Revision: https://reviews.llvm.org/D93798
