[llvm] [BOLT][RISCV]Fix handling of GOT relocation pairs (PR #149658)

[via llvm-commits]

dinyy wrote:

before fix:
```
    00000000:   auipc   t0, %pcrel_hi(__BOLT_got_zero+9880) # Label: .Ltmp16
    00000004:   auipc   t1, %pcrel_hi(__BOLT_got_zero+8140) # Label: .Ltmp17
    00000008:   ld      t0, %pcrel_lo(.Ltmp16)(t0)
    0000000c:   ld      t1, %pcrel_lo(.Ltmp17)(t1)
```
after fix:
```
    00000000:   auipc   t0, %pcrel_hi(__BOLT_got_zero+8136) # Label: .Ltmp16
    00000004:   ld      t0, %pcrel_lo(.Ltmp16)(t0)
    00000008:   auipc   t1, %pcrel_hi(__BOLT_got_zero+8144) # Label: .Ltmp17
    0000000c:   ld      t1, %pcrel_lo(.Ltmp17)(t1)
```
after fix , we could get the correct __BOLT_got_zero + offset .
And because this note in `llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp`:
```
    case R_RISCV_PCREL_LO12_I: {
      // FIXME: We assume that R_RISCV_PCREL_HI20 is present in object code and
      // pairs with current relocation R_RISCV_PCREL_LO12_I. So here may need a
      // check.
```
so move auipc instruction to  make auipc and its corresponding ld are adjacent.

https://github.com/llvm/llvm-project/pull/149658