[X86][MC][NFC] Reduce the parameters of functions in X86MCCodeEmitter(Part I)
Summary:
The function in X86MCCodeEmitter has too many parameters to make it look
messy, and some parameters are unnecessary. This is the first patch to
reduce their parameters.
The follwing operations are cheap
```
unsigned Opcode = MI.getOpcode();
const MCInstrDesc &Desc = MCII.get(Opcode);
uint64_t TSFlags = Desc.TSFlags;
```
So if we pass a `MCInst`, we don't need to pass `MCInstrDesc`;
if we pass a `MCInstrDesc`, we don't need to pass `TSFlags`.
Reviewers: craig.topper, MaskRay, pengfei
Reviewed By: craig.topper
Subscribers: annita.zhang, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78180