This reverts commit 8581937c.

The use of this macro in C++ translation units leads to the symbol visibility
being switched to default instead of hidden. This only happens in bitcode
enabled builds. A toolchain upgrade will be necessary to undo this workaround.

Fixes a regression from #16944

* Fix error message for golden failure. Fix blend test diffrate when running on MacOS

* Revert MacOS adjustment

This is not actually used by hot reload since we've switched to compilation from kernel.

Truncate error messages for the crash reporter to the maximum length permitted by the FIDL call (#17189)

This reverts commit 4196207e.

Currently every Linux runner has this code to allow relative resource paths; this moves it into the framework so that any embedder can get this behavior without that code needing to be in the template.

Rolls buildroot to pick up std::filesystem support in our libc++

Adds annotation `keepToString` to opt out.