[all-commits] [llvm/llvm-project] 9262ac: Revert "ELFObjectWriter: Optimize isInSymtab"

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9262ac3ee4d570f1f4a7300c1d723900cb7bc9bd
      https://github.com/llvm/llvm-project/commit/9262ac3ee4d570f1f4a7300c1d723900cb7bc9bd
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-07-02 (Wed, 02 Jul 2025)

  Changed paths:
    M llvm/lib/MC/ELFObjectWriter.cpp

  Log Message:
  -----------
  Revert "ELFObjectWriter: Optimize isInSymtab"

This reverts commit 1108cf64196a056aa350baba98e3fab6d7529a59.

Caused a regression for a weird but interesting case (STT_SECTION symbol
as group signature). We no longer define `sec`
```
.section sec,"ax"
.section .foo,"axG", at progbits,sec
nop
```

Fix #146581



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