[all-commits] [llvm/llvm-project] d46513: [BOLT] Fix heatmap with external addresses (#203479)

[Amir Ayupov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d46513abff5bfaf58de8169db033e54b9e24d7c2
      https://github.com/llvm/llvm-project/commit/d46513abff5bfaf58de8169db033e54b9e24d7c2
  Author: Amir Ayupov <aaupov at fb.com>
  Date:   2026-06-12 (Fri, 12 Jun 2026)

  Changed paths:
    M bolt/lib/Profile/Heatmap.cpp
    M bolt/test/X86/heatmap-preagg.test

  Log Message:
  -----------
  [BOLT] Fix heatmap with external addresses (#203479)

External samples (X:0) were breaking heatmap printing, e.g.
```
  0x00000000: O0x00000000: ........
```
Explicitly track `IsFirst` instead of relying on zero.

Test Plan:
updated heatmap-preagg.test



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