[PATCH] D149443: [ARM] add Thumb-1 8-bit movs/adds relocations to LLVM

[Ties Stuij via Phabricator via llvm-commits]

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This patch adds the LLVM-side plumbing for the following relocations:

- R_ARM_THM_ALU_ABS_G0_NC
- R_ARM_THM_ALU_ABS_G1_NC
- R_ARM_THM_ALU_ABS_G2_NC
- R_ARM_THM_ALU_ABS_G3_NC

(see section 5.6.1.5, Static Thumb16 relocations, of the AArch32 ELF Arm ABI:
https://github.com/ARM-software/abi-aa/blob/844a79fd4c77252a11342709e3b27b2c9f590cf1/aaelf32/aaelf32.rst#5615static-thumb16-relocations)

Which can respectivly be generated by prefixing assembly symbols with:

- :lower0_7:
- :lower8_15:
- :upper0_7:
- :upper8_15:

LLD support for these relocations will be added in a follow-up patch


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149443

Files:
  llvm/include/llvm/BinaryFormat/ELFRelocs/ARM.def
  llvm/lib/Target/ARM/ARMInstrInfo.td
  llvm/lib/Target/ARM/ARMInstrThumb.td
  llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMFixupKinds.h
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCCodeEmitter.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCExpr.h

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