Add a HeapType method for getting the rec group index (#4480)

Storing the rec group index on the HeapTypeInfo avoids having to do a linear
scan through the rec group to find the index for a particular type. This will
be important for isorecursive canonicalization, which uses rec group indices.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/wasm-type.h b/src/wasm-type.h
index 7b63adf9d..99194b81d 100644
--- a/src/wasm-type.h
+++ b/src/wasm-type.h
@@ -356,6 +356,7 @@ public:
 
   // Get the recursion group for this non-basic type.
   RecGroup getRecGroup() const;
+  size_t getRecGroupIndex() const;
 
   constexpr TypeID getID() const { return id; }
   constexpr BasicHeapType getBasic() const {
@@ -392,8 +393,8 @@ class RecGroup {
 
 public:
   explicit RecGroup(uintptr_t id) : id(id) {}
-  bool operator==(const RecGroup& other) { return id == other.id; }
-  bool operator!=(const RecGroup& other) { return id != other.id; }
+  bool operator==(const RecGroup& other) const { return id == other.id; }
+  bool operator!=(const RecGroup& other) const { return id != other.id; }
   size_t size() const;
 
   struct Iterator : ParentIndexIterator<const RecGroup*, Iterator> {