Use integer RTTI/witness handles in existential tuples. (#1598)

* Use integer RTTI/witness handles in existential tuples.

* Fix clang error.

* Fix IR serialization to use 16bits for opcode.

* Undo accidental comment change.

* Use variable length encoding for opcode.

* Fix compile error.

* Fixing issues

* Fix code review issues.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/slang/slang-ir-lower-generic-function.cpp b/source/slang/slang-ir-lower-generic-function.cpp
index f5bd469ac..75c58a2f4 100644
--- a/source/slang/slang-ir-lower-generic-function.cpp
+++ b/source/slang/slang-ir-lower-generic-function.cpp
@@ -170,7 +170,7 @@ namespace Slang
                     }
                     else if (entry->getRequirementVal()->op == kIROp_AssociatedType)
                     {
-                        loweredVal = builder.getPtrType(builder.getRTTIType());
+                        loweredVal = builder.getRTTIHandleType();
                     }
                     else
                     {
@@ -231,7 +231,7 @@ namespace Slang
                     // Translate a Type value to an RTTI object pointer.
                     auto rttiObject = sharedContext->maybeEmitRTTIObject(entry->getSatisfyingVal());
                     auto rttiObjectPtr = builder->emitGetAddress(
-                        builder->getPtrType(builder->getRTTIType()),
+                        builder->getRTTIHandleType(),
                         rttiObject);
                     entry->satisfyingVal.set(rttiObjectPtr);
                 }