Support pause/resume through Try

[stevenfontanella]

Run from the latest main e29edae. Reduced WAT.

Command:

 bin/wasm-opt   --enable-threads \
  --enable-mutable-globals \
  --enable-nontrapping-float-to-int \
  --enable-simd \
  --enable-bulk-memory \
  --enable-sign-ext \
  --enable-exception-handling \
  --enable-tail-call \
  --enable-reference-types \
  --enable-gc \
  --enable-memory64 \
  --enable-relaxed-simd \
  --enable-extended-const \
  --enable-strings \
  --enable-multimemory \
  --enable-stack-switching \
  --enable-shared-everything \
  --enable-bulk-memory-opt \
  --enable-call-indirect-overlong \
  --enable-custom-descriptors \
  --enable-relaxed-atomics \
  --enable-custom-page-sizes \
  --enable-multibyte \
  --enable-wide-arithmetic \
  --closed-world \
  --fuzz-exec \
  fuzzed.wast

Output:

wasm-opt: /usr/local/google/home/stevenfont/code/binaryen-jj/binaryen/src/wasm-interpreter.h:4844: wasm::Flow wasm::ModuleRunnerBase<SubType>::visitTry(wasm::Try*) [with SubType = wasm::ModuleRunner]: Assertion `!self()->isResuming()' failed.

[kripken]

visitTry(wasm::Try*): Assertion !self()->isResuming()' failed.`

Ah, I think this happens when we pause and the stack trace contains a Try. We should probably implement that, though it is annoying, and just for legacy EH...