bdcabc4862
When the last PT_LOAD segment is executable and includes BSS sections, its p_memsz may exceed the aligned p_filesz. This change ensures p_memsz is not reduced in such cases (e.g. --omagic). In addition, disable this behavior when a SECTIONS command is specified. Refined behavior introduced in https://reviews.llvm.org/D37369 (2017). The -z separate-loadable-segments --omagic test adds coverage for the option combination, even if it might be practical. Pull Request: https://github.com/llvm/llvm-project/pull/139207