An AArch64 LE relocation is a positive ("variant 1") offset. This
relocation is used to write the upper 12 bits of a 24-bit offset into an
add x0, x0, :tprel_hi12:v1
The comment in the ARM docs for R_AARCH64_TLSLE_ADD_TPREL_HI12 is:
"Set an ADD immediate field to bits [23:12] of X; check 0 <= X < 2^24."