1. [builtins] Add COMPILER_RT_BUILTINS_HIDE_SYMBOLS (details)
Commit 658a1be76ba2e9880bc1dd530869a45be452344c by rprichard

On Android, when the builtins are linked into a binary, they are
typically linked using -Wl,--exclude-libs so that the symbols aren't
reexported. For the NDK, compiler-rt's default behavior (build the
builtins archive with -fvisibility=hidden) is better so that builtins
are hidden even without -Wl,--exclude-libs.

Android needs the builtins with non-hidden symbols only for a special
case: for backwards compatibility with old binaries, the and DSOs in the platform need to export some builtins for arm32 and
32-bit x86. See D56977.

Control the behavior with a new flag,
`COMPILER_RT_BUILTINS_HIDE_SYMBOLS`, that behaves similarly to the
`*_HERMETIC_STATIC_LIBRARY` in libunwind/libcxx/libcxxabi, so that
Android can build a special builtins variant for

Unlike the hermetic flags for other projects, this new flag is enabled
by default.

Reviewed By: compnerd, MaskRay

Differential Revision:
The file was modifiedcompiler-rt/lib/builtins/CMakeLists.txt