[all-commits] [llvm/llvm-project] dc93b1: [profile] Delete zero-size dummy sections

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dc93b1127c5e0621e672745d26bce5a11f68d943
      https://github.com/llvm/llvm-project/commit/dc93b1127c5e0621e672745d26bce5a11f68d943
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-02-28 (Sun, 28 Feb 2021)

  Changed paths:
    M compiler-rt/lib/profile/InstrProfilingPlatformLinux.c

  Log Message:
  -----------
  [profile] Delete zero-size dummy sections

They were added so that if no metadata section is present,
`__start_llvm_prf_*` references would not cause "undefined symbol"
errors.  By switching to undefined weak symbols in D96936, the dummy
sections are not needed.

This patch is also needed to work around
https://sourceware.org/bugzilla/show_bug.cgi?id=27490

Differential Revision: https://reviews.llvm.org/D97648