Support remaping of pair location inside materializations for slow paths.

runtime/vm/locations.h

Index: runtime/vm/locations.h
diff --git a/runtime/vm/locations.h b/runtime/vm/locations.h
index e4bf340f18a8e726c73f515c5c1549899c8eb5b3..0b9bf509a1bd4cb791483adc5a54582ff81403ac 100644
--- a/runtime/vm/locations.h
+++ b/runtime/vm/locations.h
@@ -11,10 +11,12 @@
 
 namespace dart {
 
+
 class BufferFormatter;
-class Value;
-class PairLocation;
 class ConstantInstr;
+class Definition;
+class PairLocation;
+class Value;
 
 
 enum Representation {
@@ -370,6 +372,10 @@ class Location : public ValueObject {
 
   Location Copy() const;
 
+  Location RemapForSlowPath(Definition* def,
+                            intptr_t* cpu_reg_slots,
+                            intptr_t* fpu_reg_slots) const;
+
  private:
   explicit Location(uword value) : value_(value) { }