[TypedFunctionReferences] Enable call_ref in fuzzer, and fix minor misc fuzz bugs (#3401)

* Count signatures in tuple locals.
* Count nested signature types (confirming @aheejin was right, that was missing).
* Inlining was using the wrong type.
* OptimizeInstructions should return -1 for unhandled types, not error.
* The fuzzer should check for ref types as well, not just typed function references,
  similar to what GC does.
* The fuzzer now creates a function if it has no other option for creating a constant
  expression of a function type, then does a ref.func of that.
* Handle unreachability in call_ref binary reading.
* S-expression parsing fixes in more places, and add a tiny fuzzer for it.
* Switch fuzzer test to just have the metrics, and not print all the fuzz output which
  changes a lot. Also fix noprint handling which only worked on binaries before.
* Fix Properties::getLiteral() to use the specific function type properly, and make
  Literal's function constructor require that, to prevent future bugs.
* Turn all input types into nullable types, for now.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/passes/OptimizeInstructions.cpp b/src/passes/OptimizeInstructions.cpp
index 56c99984a..dd088b03b 100644
--- a/src/passes/OptimizeInstructions.cpp
+++ b/src/passes/OptimizeInstructions.cpp
@@ -121,7 +121,9 @@ struct LocalScanner : PostWalker<LocalScanner> {
   Index getMaxBitsForLocal(LocalGet* get) { return getBitsForType(get->type); }
 
   Index getBitsForType(Type type) {
-    TODO_SINGLE_COMPOUND(type);
+    if (!type.isBasic()) {
+      return -1;
+    }
     switch (type.getBasic()) {
       case Type::i32:
         return 32;