update testsuite, handle implicit func types (#96)

Change 7c482b1a of the spec repo now requires that implicit function
types are created when creating a new func or import, but only when the
type is not explicitly specified, and the have not been specified. For
example:

```
(func (param i32))
(import "foo" "bar" (result i32)
```

This was previously done in sexpr-wasm when writing the binary, but now
these types can be referenced by `call_import`, so it has to be handled
earlier.

Since all signatures are now defined in the module, I made it so the
function signature is shared with the module function types. The tricky
part here is when a function type and an explicit signature are both
specified:

```
(func (type $t) (param f32) ...)
```

In this case, we need to keep the explicit signature around long enough
to be checked against the function type, so it must be owned by the
function. The WASM_FUNC_DECLARATION_FLAG_SHARED_SIGNATURE flag specifies
this case.

To simplify code that uses the AST, I reverted many of the
changes introduced in 73e5bc7d. Now the function declaration's signature
is always valid to access, and will have been resolved if it was
specified with a func type instead of an explicit signature.

Some other changes:

* There was a bug in the interpreter's `f32.demote/f64` rounding when
  given a value that is very close to positive or negative F32_MAX

* Added `update-spec-tests.py` to more easily update the spec tests in
  `test/interp/spec/*.txt` from the files in
  `third_party/testsuite/*.wast`. Previously I would just do it
  manually.

1 files changed, 0 insertions, 0 deletions

diff --git a/third_party/testsuite b/third_party/testsuite
-Subproject 88274ef4376b5a679a2cd0a1d630bf7e71f96cf
+Subproject d4b150ce7268f903757ebdf1c7c001c99607da7