Finish implementing lazy deoptimization (ia32, x64). Ran tests with --deoptimize-alot.

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 12092)
+++ runtime/vm/object.h	(working copy)
@@ -2276,6 +2276,7 @@
     kDeoptAfter,       // Deoptimization continuation point after instruction.
     kDeoptIndex,       // Index into deopt info array.
     kPatchCode,        // Buffer for patching code entry.
+    kLazyDeoptJump,    // Lazy deoptimization trampoline.
     kIcCall,           // IC call.
     kFuncCall,         // Call to known target, e.g. static call, closure call.
     kReturn,           // Return from function.
@@ -2323,6 +2324,9 @@
 
   static RawPcDescriptors* New(intptr_t num_descriptors);
 
+  // Returns 0 if not found.
+  uword GetPcForKind(Kind kind) const;
+
   // Verify (assert) assumptions about pc descriptors in debug mode.
   void Verify(bool check_ids) const;
 
@@ -2656,8 +2660,9 @@
   }
   intptr_t GetTokenIndexOfPC(uword pc) const;
 
-  // Find pc of patch code buffer. Return 0 if not found.
+  // Find pc, return 0 if not found.
   uword GetPatchCodePc() const;
+  uword GetLazyDeoptPc() const;
 
   uword GetDeoptBeforePcAtDeoptId(intptr_t deopt_id) const;
   uword GetDeoptAfterPcAtDeoptId(intptr_t deopt_id) const;