Use portable flag with nm in extract_symbols.py
Summary:
nm is one of the tools that extract_symbols.py can use to extract
symbols from llvm libraries as part of the build process. This patch
updates the invocation of nm to use the -P POSIX option for "portable
output" so we get a consistently parsable output format on all
platforms.
A link to the relevant nm format: https://pubs.opengroup.org/onlinepubs/
9699919799/utilities/nm.html
Reviewers: hubert.reinterpretcast, stevewan, sfertile
Reviewed By: stevewan
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69004