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, 2 insertions, 2 deletions

diff --git a/src/ir/block-utils.h b/src/ir/block-utils.h
index 120178a47..1ed9ee413 100644
--- a/src/ir/block-utils.h
+++ b/src/ir/block-utils.h
@@ -39,7 +39,7 @@ simplifyToContents(Block* block, T* parent, bool allowTypeChange = false) {
     auto* singleton = list[0];
     auto sideEffects =
       EffectAnalyzer(parent->getPassOptions(), singleton).hasSideEffects();
-    if (!sideEffects && !isConcreteType(singleton->type)) {
+    if (!sideEffects && !singleton->type.isConcrete()) {
       // no side effects, and singleton is not returning a value, so we can
       // throw away the block and its contents, basically
       return Builder(*parent->getModule()).replaceWithIdenticalType(block);
@@ -50,7 +50,7 @@ simplifyToContents(Block* block, T* parent, bool allowTypeChange = false) {
       // inside is unreachable (if both concrete, must match, and since no name
       // on block, we can't be branched to, so if singleton is unreachable, so
       // is the block)
-      assert(isConcreteType(block->type) && singleton->type == unreachable);
+      assert(block->type.isConcrete() && singleton->type == unreachable);
       // we could replace with unreachable, but would need to update all
       // the parent's types
     }