Move event section before global section

[rossberg]

The proposal currently positions the event section after the global section. However, it is perceivable that under some future extensions, the initialiser expressions for a global might be generalised such that they can contain instructions that refer to exceptions. At the same time, there is no apparent reason to assume that exception defs would ever need to refer to globals.

Thus, in order to keep validation as single-pass as possible, I'd propose switching the order of global and event section in the binary format.

[aheejin]

Sounds good. I requested this change in v8. Will change this in LLVM / Binaryen/ Wabt after V8 change is implemented.

[aheejin]

This has been reflected in:
LLVM: llvm/llvm-project@f93426c
V8: v8/v8@92bd781
Binaryen: WebAssembly/binaryen#2708
Wabt: WebAssembly/wabt#1374

Closing this.