Add fast 64-bit bitwise negation to the IA32 optimizing compiler.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 13214)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -1212,6 +1212,16 @@
 }
 
 
+RawAbstractType* UnboxedMintUnaryOpInstr::CompileType() const {
+  return Type::IntType();
+}
+
+
+intptr_t UnboxedMintUnaryOpInstr::ResultCid() const {
+  return kDynamicCid;
+}
+
+
 RawAbstractType* UnboxedDoubleBinaryOpInstr::CompileType() const {
   return Type::Double();
 }