[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, 10 insertions, 0 deletions

diff --git a/test/passes/optimize-instructions_all-features.wast b/test/passes/optimize-instructions_all-features.wast
index 9efd94c22..3b25238c0 100644
--- a/test/passes/optimize-instructions_all-features.wast
+++ b/test/passes/optimize-instructions_all-features.wast
@@ -6162,3 +6162,13 @@
     )
   )
 )
+;; typed function references
+(module
+  (type $i32-i32 (func (param i32) (result i32)))
+  ;; this function has a reference parameter. we analyze parameters, and should
+  ;; not be confused by a type that has no bit size, in particular. this test
+  ;; just verifies that we do not crash on that.
+  (func $call_from-param (param $f (ref null $i32-i32)) (result i32)
+    (unreachable)
+  )
+)