Multivalue type creation and inspection (#2459)

Adds the ability to create multivalue types from vectors of concrete value
types. All types are transparently interned, so their representation is still a
single uint32_t. Types can be extracted into vectors of their component parts,
and all the single value types expand into vectors containing themselves.

Multivalue types are not yet used in the IR, but their creation and inspection
functionality is exposed and tested in the C and JS APIs.

Also makes common type predicates methods of Type and improves the ergonomics of
type printing.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/passes/I64ToI32Lowering.cpp b/src/passes/I64ToI32Lowering.cpp
index 5d7d5998c..b51858474 100644
--- a/src/passes/I64ToI32Lowering.cpp
+++ b/src/passes/I64ToI32Lowering.cpp
@@ -1504,7 +1504,7 @@ private:
     std::vector<Expression*> children;
     bool hasUnreachable = false;
     for (auto* child : ChildIterator(curr)) {
-      if (isConcreteType(child->type)) {
+      if (child->type.isConcrete()) {
         child = builder->makeDrop(child);
       } else if (child->type == unreachable) {
         hasUnreachable = true;