Speculate on bitwise operators.

runtime/vm/token.cc

Index: runtime/vm/token.cc
diff --git a/runtime/vm/token.cc b/runtime/vm/token.cc
index b6a34ce4bd56c4182e44515634f90be157c7f597..b29f5bc93d3f1172931432ab72922fe641c75d62 100644
--- a/runtime/vm/token.cc
+++ b/runtime/vm/token.cc
@@ -77,4 +77,18 @@ bool Token::IsUnaryArithmeticOperator(Token::Kind token) {
   return (token == kBIT_NOT) || (token == kNEGATE);
 }
 
+
+bool Token::IsBinaryBitwiseOperator(Token::Kind token) {
+  switch (token) {
+    case Token::kBIT_OR:
+    case Token::kBIT_XOR:
+    case Token::kBIT_AND:
+    case Token::kSHL:
+    case Token::kSHR:
+      return true;
+    default:
+      return false;
+  }
+}
+
 }  // namespace dart