VM/Mac: Prevent dead_strip from removing API functions.
VM/Mac: Prevent dead_strip from removing API functions.

strip -x xcodebuild/ReleaseX64/dart
6915912 -> 6996096 (+1.15%)

BUG=http://dartbug.com/26113
R=iposva@google.com

Review URL: https://codereview.chromium.org/1842613002 .

dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk