Support Bigint parameters in Int32x4 constructor

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 82aed25681b2f2212561c6c3452b3ceb78d5d780..a7c1d931b70b065583d6114ebeef7574d0ee99d6 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -12821,6 +12821,12 @@ int64_t Integer::AsInt64Value() const {
 }
 
 
+int32_t Integer::AsTruncatedUint32Value() const {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
 int Integer::CompareWith(const Integer& other) const {
   UNIMPLEMENTED();
   return 0;
@@ -13090,6 +13096,11 @@ int64_t Smi::AsInt64Value() const {
 }
 
 
+int32_t Smi::AsTruncatedUint32Value() const {
+  return this->Value() & 0xFFFFFFFF;
+}
+
+
 static bool FitsIntoSmi(const Integer& integer) {
   if (integer.IsSmi()) {
     return true;
@@ -13223,6 +13234,11 @@ int64_t Mint::AsInt64Value() const {
 }
 
 
+int32_t Mint::AsTruncatedUint32Value() const {
+  return this->value() & 0xFFFFFFFF;
+}
+
+
 int Mint::CompareWith(const Integer& other) const {
   ASSERT(!FitsIntoSmi(*this));
   if (other.IsMint() || other.IsSmi()) {
@@ -13490,6 +13506,11 @@ int64_t Bigint::AsInt64Value() const {
 }
 
 
+int32_t Bigint::AsTruncatedUint32Value() const {
+  return BigintOperations::TruncateToUint32(*this);
+}
+
+
 // For positive values: Smi < Mint < Bigint.
 int Bigint::CompareWith(const Integer& other) const {
   ASSERT(!FitsIntoSmi(*this));