[PAC][AArch64][ELF] Support signed TLSDESC #78
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Support the following relocations and assembly operators: - `R_AARCH64_AUTH_TLSDESC_ADR_PAGE21` (`:tlsdesc_auth:` for `adrp`) - `R_AARCH64_AUTH_TLSDESC_LD64_LO12` (`:tlsdesc_auth_lo12:` for `ldr`) - `R_AARCH64_AUTH_TLSDESC_ADD_LO12` (`:tlsdesc_auth_lo12:` for `add`) `TLSDESC_AUTH_CALLSEQ` pseudo-instruction is introduced which is later expanded to actual instruction sequence like the following. ``` adrp x0, :tlsdesc:var ldr x16, [x0, #:tlsdesc_lo12:var] add x0, x0, #:tlsdesc_lo12:var autia x16, x0 .tlsdesccall var blr x16 (TPIDR_EL0 offset now in x0) ``` FIXME: use BLRAA instead of AUTIA + BLR. BLRAA is currently explicitly unsupported in AArch64SLSHardening pass. Only SelectionDAG ISel is supported. Tests with 'auth' in name have corresponding variants w/o it.
Support `R_AARCH64_AUTH_TLSDESC_ADR_PAGE21`, `R_AARCH64_AUTH_TLSDESC_LD64_LO12` and `R_AARCH64_AUTH_TLSDESC_LD64_LO12` static TLSDESC relocations.
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