[threads] ref.i31_shared (#6735)

Implement `ref.i31_shared` the new instruction for creating references
to shared i31s. Implement binary and text parsing and emitting as well
as interpretation. Copy the upstream spec test for i31 and modify it so
that all the heap types are shared. Comment out some parts that we do
not yet support.

1 files changed, 8 insertions, 3 deletions

diff --git a/src/parser/contexts.h b/src/parser/contexts.h
index f58275d71..96a70663d 100644
--- a/src/parser/contexts.h
+++ b/src/parser/contexts.h
@@ -695,7 +695,10 @@ struct NullInstrParserCtx {
   Result<> makeCallRef(Index, const std::vector<Annotation>&, HeapTypeT, bool) {
     return Ok{};
   }
-  Result<> makeRefI31(Index, const std::vector<Annotation>&) { return Ok{}; }
+  Result<>
+  makeRefI31(Index, const std::vector<Annotation>&, Shareability share) {
+    return Ok{};
+  }
   Result<> makeI31Get(Index, const std::vector<Annotation>&, bool) {
     return Ok{};
   }
@@ -2363,8 +2366,10 @@ struct ParseDefsCtx : TypeParserCtx<ParseDefsCtx> {
     return withLoc(pos, irBuilder.makeCallRef(type, isReturn));
   }
 
-  Result<> makeRefI31(Index pos, const std::vector<Annotation>& annotations) {
-    return withLoc(pos, irBuilder.makeRefI31());
+  Result<> makeRefI31(Index pos,
+                      const std::vector<Annotation>& annotations,
+                      Shareability share) {
+    return withLoc(pos, irBuilder.makeRefI31(share));
   }
 
   Result<> makeI31Get(Index pos,