felipecrv opened a new pull request, #41021:
URL: https://github.com/apache/arrow/pull/41021
### Rationale for this change
Allow portable use of the "assumption" feature of modern GCC, Clang, and
MSVC compilers.
### What changes are included in this PR?
- Documenting of macros in `macros.h`
- Addition of `ARROW_COMPILER_ASSUME`
- One simple change where this macro simplifies the existing code while
keeping the common case of a loop branch dependent only on local variables
### Are these changes tested?
By existing tests.
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