Correct some intrinsic signatures

While this doesn't currently cause issues in the upcoming webidl
refactor this is actually being asserted and causes verification issues
if the types don't align!

These are basically just mistakes from the original implementation of
this module, but this doesn't actually fix a known bug today.

Author: alexcrichton

crates/cli-support/src/intrinsic.rs

@@ -110,13 +110,13 @@ intrinsics! {
         #[signature = fn(ref_string()) -> Anyref]
         SymbolNamedNew,
         #[symbol = "__wbindgen_number_get"]
-        #[signature = fn(ref_anyref(), F64) -> F64]
+        #[signature = fn(ref_anyref(), I32) -> F64]
         NumberGet,
         #[symbol = "__wbindgen_string_get"]
         #[signature = fn(ref_anyref(), I32) -> I32]
         StringGet,
         #[symbol = "__wbindgen_boolean_get"]
-        #[signature = fn(ref_anyref()) -> F64]
+        #[signature = fn(ref_anyref()) -> I32]
         BooleanGet,
         #[symbol = "__wbindgen_throw"]
         #[signature = fn(ref_string()) -> Unit]
@@ -143,7 +143,7 @@ intrinsics! {
         #[signature = fn(ref_anyref()) -> String]
         JsonSerialize,
         #[symbol = "__wbindgen_anyref_heap_live_count"]
-        #[signature = fn() -> F64]
+        #[signature = fn() -> I32]
         AnyrefHeapLiveCount,
         #[symbol = "__wbindgen_init_nyref_table"]
         #[signature = fn() -> Unit]