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Add ELF relocations for the following fixups: fixup_thumb_adr_pcrel_10 -> R_ARM_THM_PC8 fixup_thumb_cp -> R_ARM_THM_PC8 fixup_t2_adr_pcrel_12 -> R_ARM_THM_PREL_11_0 fixup_t2_ldst_pcrel_12 -> R_ARM_THM_PC12 While these relocations are short-ranged there is support in the open source ELF linker's in binutils and soon to be in LLD. MC will no longer resolve pc-relative fixups to global symbols due to interpositioning concerns. We can handle these at link time by implementing the relocations. The R_ARM_THM_PC8 has some extra encoding rules for addends that llvm-mc sidesteps by not supporting addends for these instructions, using the wide Thumb 2 instruction if it is available. I think that this is a reasonable compromise given that these are rare. This partiall reverts D72892, the Thumb fixups no longer need to be evaluated at assembly time. Differential Revision: https://reviews.llvm.org/D75039
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