[NFC] Add constexpr HeapTypes for basic heap types (#6662)

Since the BasicHeapTypes are in an enum, calling HeapType methods on them
requires something like `HeapType(HeapType::func).someMethod()`. This is
unnecessarily verbose, so add a new `HeapTypes` namespace that contains
constexpr HeapType globals that can be used instead, shorting this to
`HeapTypes::func.someMethod()`.

1 files changed, 4 insertions, 4 deletions

diff --git a/test/example/typeinfo.cpp b/test/example/typeinfo.cpp
index 4edf1cc5d..a8035545b 100644
--- a/test/example/typeinfo.cpp
+++ b/test/example/typeinfo.cpp
@@ -96,16 +96,16 @@ void test_compound() {
 void test_printing() {
   {
     std::cout << ";; Heap types\n";
-    std::cout << HeapType(HeapType::func) << "\n";
+    std::cout << HeapTypes::func << "\n";
     std::cout << Type(HeapType::func, Nullable) << "\n";
     std::cout << Type(HeapType::func, NonNullable) << "\n";
-    std::cout << HeapType(HeapType::any) << "\n";
+    std::cout << HeapTypes::any << "\n";
     std::cout << Type(HeapType::any, Nullable) << "\n";
     std::cout << Type(HeapType::any, NonNullable) << "\n";
-    std::cout << HeapType(HeapType::eq) << "\n";
+    std::cout << HeapTypes::eq << "\n";
     std::cout << Type(HeapType::eq, Nullable) << "\n";
     std::cout << Type(HeapType::eq, NonNullable) << "\n";
-    std::cout << HeapType(HeapType::i31) << "\n";
+    std::cout << HeapTypes::i31 << "\n";
     std::cout << Type(HeapType::i31, Nullable) << "\n";
     std::cout << Type(HeapType::i31, NonNullable) << "\n";
     std::cout << Signature(Type::none, Type::none) << "\n";