Fix LLVM relocations and SIMD operations on aarch64

[xdoardo]

Some of the required relocations for LLVM on aarch64 (ELF) are missing. Furthermore, some of the WAST tests related to SIMD instructions fail, for example:

--- STDERR:              wasmer-workspace::compilers wast::spec::simd_lane::llvm::universal ---
Error: Failed directives on tests/wast/spec/simd_lane.wast:
  • expected Core(V128(I8x16([0, 0, 0, 0, 0, 0, 0, 0, -16, -16, -16, -16, -16, -16, -16, -16]))), got I8x16([0, 0, 0, -13, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]) (v128 bits: 3302611746816) (357:1)
  • expected Core(V128(I8x16([85, -1, 85, -1, 85, -1, 85, -1, 85, -1, 85, -1, 85, -1, 85, -1]))), got I8x16([0, 0, 0, 0, 0, 85, 85, 0, 0, 85, -1, 0, -1, 0, 85, 0]) (v128 bits: 441365436465578971007971732593049600) (696:1)