Fuzzer: Do not fuzz multivalue testcases in initial contents (#3809)
Fuzzer: Do not fuzz multivalue testcases in initial contents (#3809)

There is a conflict between multivalue and GC, see the details in the
comment. There isn't a good way to get the fuzzer to avoid the combination
of them, and GC is more urgent, so disable multivalue in that area for now.

(This does not disable all multivalue fuzzing - the fuzzer can still emit stuff.
This just disables initial content from test suite having multivalue, which
is enough for now, until the fuzzer can emit more GC things, and then we'll
need to do more.)
WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen,WebAssembly/binaryen