cmd/internal/objfile: use 'B' code for ELF and PE BSS symbols

For ELF check for the ELF NOBITS section type. Anything in NOBITS
is a BSS symbols.

For PE look for runtime.bss; for a Go program, anything runtime.bss
is a BSS symbol.

Fixes #77301

Change-Id: I15b9af4513a5eb0e8955014a12073c2b56bcefab
Reviewed-on: https://go-review.googlesource.com/c/go/+/739080
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
7 files changed
tree: dce1f642d016ee89f7c627215599417177f080d1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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