[interpreter] Implement OSR graph construction from bytecode.

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 3a74a287a8e4c68e669a07161c2e926292efe23d..954bfd2fee8b78f15a58afcd87c2164f8b5f96af 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -422,6 +422,9 @@ class Linkage : public ZoneObject {
   // A special {OsrValue} index to indicate the context spill slot.
   static const int kOsrContextSpillSlotIndex = -1;
 
+  // A special {OsrValue} index to indicate the accumulator register.
+  static const int kOsrAccumulatorRegisterIndex = -1;
+
  private:
   CallDescriptor* const incoming_;