Add event section (#2151)

This adds support for the event and the event section, as specified in
https://github.com/WebAssembly/exception-handling/blob/master/proposals/Exceptions.md#changes-to-the-binary-model.

Wasm events are features that suspend the current execution and transfer
the control flow to a corresponding handler. Currently the only
supported event kind is exceptions.

For events, this includes support for
- Binary file reading/writing
- Wast file reading/writing
- Binaryen.js API
- Fuzzer
- Validation
- Metadce
- Passes: metrics, minify-imports-and-exports,
  remove-unused-module-elements

1 files changed, 1 insertions, 0 deletions

diff --git a/src/passes/Metrics.cpp b/src/passes/Metrics.cpp
index af5a62697..a408ccf95 100644
--- a/src/passes/Metrics.cpp
+++ b/src/passes/Metrics.cpp
@@ -66,6 +66,7 @@ struct Metrics
     counts["[imports]"] = imports.getNumImports();
     counts["[funcs]"] = imports.getNumDefinedFunctions();
     counts["[globals]"] = imports.getNumDefinedGlobals();
+    counts["[events]"] = imports.getNumDefinedEvents();
     counts["[exports]"] = module->exports.size();
     // add memory and table
     if (module->memory.exists) {