But only produce a warning (for now) unless --fatal-warnings is passed. Differential Revision: https://reviews.llvm.org/D46484 llvm-svn: 331574
This enables callback-style programming where the JavaScript environment can call back into the Wasm environment using a function pointer received from the module. Differential Revision: https://reviews.llvm.org/D44427 llvm-svn: 328643