[PATCH] D77737: [SPARC] Recognize and handle the %lm(sym) operator

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`R_SPARC_LM22` is similar in spirit (and encoding and behaviour) to `R_SPARC_HI22` but truncates the result instead of raising an error on overflow.

The codegen backend now emits a "canonical" [1] set of `R_SPARC_HH22`, `R_SPARC_HM10`, `R_SPARC_LM22` and `R_SPARC_LO10` relocations, there are no functional changes.

[1] https://docs.oracle.com/cd/E36784_01/html/E36858/gmadr.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D77737

Files:
  llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
  llvm/lib/Target/Sparc/MCTargetDesc/SparcELFObjectWriter.cpp
  llvm/lib/Target/Sparc/MCTargetDesc/SparcFixupKinds.h
  llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
  llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h
  llvm/lib/Target/Sparc/SparcAsmPrinter.cpp
  llvm/test/MC/Sparc/sparc-relocations.s

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