cmd/compile: emit DWARF call_line attrs with data4 form on iOS

When targeting iOS, change the format (DWARF "form") of the call line
attribute for inlined subroutine DIEs, to work around an apparent bug
in /usr/bin/symbols on Darwin.

[Just for posterity: there is nothing wrong with using DW_FORM_udata
for the call_line attribute form; this is perfectly legal DWARF (and
is in fact recommended by the standard relative to data4, which is
less descriptive and often takes more space). The form switch is there
just to make the Apple tools happy.]

Updates #31459.

Change-Id: Iaf362788a8c6684eea4cde8956c0661b694cecc1
Reviewed-on: https://go-review.googlesource.com/c/go/+/174538
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
2 files changed
tree: 806cb8c7ca1a1c7085a262ac4708fdeb49ae23bc
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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