[llvm] [PAC][CodeGen][ELF][AArch64] Support signed GOT with tiny code model (PR #114525)

[Fangrui Song via llvm-commits]

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+; RUN: llc -verify-machineinstrs -mtriple=aarch64 -mattr=+pauth -mattr=+fpac -code-model=tiny \
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MaskRay wrote:

Perhaps combine pic and static .ll tests and just use update_llc_test_checks.py

https://github.com/llvm/llvm-project/pull/114525