[PATCH] D52405: [libc++] Use exclude_from_explicit_instantiation instead of always_inline

[Eric Fiselier via Phabricator]

EricWF added a comment.

LGTM other than the inline comments.

The chrome binary size goes from `810 MB` to `756 MB` after this patch.



================
Comment at: libcxx/include/__config:802
+#if __has_attribute(exclude_from_explicit_instantiation)
+#  define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__ ((exclude_from_explicit_instantiation))
+#else
----------------
We should use the reserved spelling `__exclude_from_explicit_instantiation__`.


Repository:
  rCXX libc++

https://reviews.llvm.org/D52405