Bug 1454923: Add debugging support for anyref return values in wasm; r=lth

--HG--
extra : rebase_source : 7da83800e74d72ad1f0ef312f50a4b2649a52c65
extra : amend_source : 0eae3689ff025bb43184e662f27aac7fefddeaa7

js/src/jit-test/tests/wasm/gc/anyref.js

@@ -150,6 +150,12 @@ ref = exports.nested(baguette, 0);
 assertEq(ref, baguette);
 assertEq(ref.calories, baguette.calories);
 
+if (wasmDebuggingIsSupported()) {
+    let g = newGlobal();
+    let dbg = new Debugger(g);
+    g.eval(`o = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary('(module (func (result anyref) (param anyref) get_local 0) (export "" 0))')));`);
+}
+
 // More interesting use cases about control flow joins.
 
 function assertJoin(body) {

js/src/wasm/WasmBaselineCompile.cpp

@@ -3429,6 +3429,9 @@ class BaseCompiler final : public BaseCompilerInterface
           case ExprType::F32:
             masm.storeFloat32(RegF32(ReturnFloat32Reg), resultsAddress);
             break;
+          case ExprType::AnyRef:
+            masm.storePtr(RegPtr(ReturnReg), resultsAddress);
+            break;
           default:
             MOZ_CRASH("Function return type");
         }
@@ -3453,6 +3456,9 @@ class BaseCompiler final : public BaseCompilerInterface
           case ExprType::F32:
             masm.loadFloat32(resultsAddress, RegF32(ReturnFloat32Reg));
             break;
+          case ExprType::AnyRef:
+            masm.loadPtr(resultsAddress, RegPtr(ReturnReg));
+            break;
           default:
             MOZ_CRASH("Function return type");
         }