[RISCV] Optimization for using compressed beqz and bnez PR#56391

Optimization for using compressed beqz and bnez

If there is pattern
```
br_cc val1 constval eq/neq place
select_cc val1 constval eq/neq trueval falseval
```
and constval does not fit in compressed imm format(6 bit), but fit in
imm format(12 bit), we can replace by non compress sub and compress
c.beqz/c.bneqz:

```
addi val val -constval
c.beqz val place
```

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D132839