[PATCH] D145118: [ELF][RISCV] Make .sdata and .sbss closer

[Fangrui Song via Phabricator via llvm-commits]

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GNU ld's internal linker scripts for RISC-V place .sdata and .sbss close.
This makes GP relaxation more profitable.

While here, when .sbss is present, set `__bss_start` to the start of
.sbss instead of .bss, to match GNU ld.

Note: GNU ld's internal linker scripts have symbol assignments and input
section descriptions which are not relevant for modern systems. We only
add things that make sense.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145118

Files:
  lld/ELF/Writer.cpp
  lld/test/ELF/riscv-gp-no-sdata.s
  lld/test/ELF/riscv-section-layout.s

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