LLVM 19 will soon be released. This post provides a summary of mycontributions in this release cycle to record my learning progress.LLVM MC: Integratedassembler improvements in LLVM 19lld/ELF:lld 19 ELFchangesAArch64[AArch64]Implement -fno-plt for SelectionDAG/GlobalISel[AArch64]Support optional constant offset for constraint "S"[AArch64AsmParser]Allow branch target symbol to have a shift/extend modifier name[MC,AArch64]Create mapping symbols with non-unique namesARM[ARM,MC]Support FDPIC relocations. See MMU-less systems andFDPICRISC-V[RISCV]Support constraint "s"[MC,RISCV]Create mapping symbo
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