…rective

Refer to RISCV, we will fix up the alignment if linker relaxation changes
code size and breaks alignment. Insert enough Nops and emit R_LARCH_ALIGN
relocation type so that linker could satisfy the alignment by removing Nops.
It does so only in sections with the SHF_EXECINSTR flag.

In LoongArch psABI v2.30, R_LARCH_ALIGN requires symbol index. The
lowest 8 bits of addend represent alignment and the other bits of
addend represent the maximum number of bytes to emit.