VM: Fix bugs with missing deoptimization environment and int32x4 constructor

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
diff --git a/runtime/vm/intermediate_language.cc b/runtime/vm/intermediate_language.cc
index 47e7dab5dd17252dab67b347c45110feb3f8fa34..6f29fd07ead0e606d566bf7f24d4cae293822224 100644
--- a/runtime/vm/intermediate_language.cc
+++ b/runtime/vm/intermediate_language.cc
@@ -1257,6 +1257,18 @@ bool UnboxInt32Instr::CanDeoptimize() const {
 }
 
 
+bool UnboxUint32Instr::CanDeoptimize() const {
+  ASSERT(is_truncating());
+  if ((value()->Type()->ToCid() == kSmiCid) ||
+      (value()->Type()->ToCid() == kMintCid)) {
+    return false;
+  }
+  // Check input value's range.
+  Range* value_range = value()->definition()->range();
+  return !RangeUtils::Fits(value_range, RangeBoundary::kRangeBoundaryInt64);
+}
+
+
 bool BinaryInt32OpInstr::CanDeoptimize() const {
   switch (op_kind()) {
     case Token::kBIT_AND: