[lld][LoongArch] Support the R_LARCH_CALL36 relocation type (#73346)

R_LARCH_CALL36 was designed for function call on medium code model where
the 2 instructions (pcaddu18i + jirl) must be adjacent. This is expected
to replace current medium code model implementation, i.e.
R_LARCH_PCALA_{HI20,LO12} on pcalau12i + jirl.

See https://github.com/loongson/la-abi-specs/pull/3 for more details.