[JITLink][ELF][AArch64] Implement ADR_PREL_PG_HI21, ADD_ABS_LO12_NC.

Implements R_AARCH64_ADR_PREL_PG_HI21 and R_AARCH64_ADD_ABS_LO12_NC fixup edges
using the generic aarch64 patch edges.

Reviewed By: lhames, sgraenitz

Differential Revision: https://reviews.llvm.org/D126287