Revert "Initial implementation of on-stack replacement (OSR)."

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index d7f9b28556179932ecc84aa74c327393adba4664..492b5950b385f0ac9b1e6a64b1fc8b4891415031 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2542,7 +2542,6 @@ class PcDescriptors : public Object {
     kClosureCall,      // Closure call.
     kRuntimeCall,      // Runtime call.
     kReturn,           // Return from function.
-    kOsrEntry,         // OSR entry point in unoptimized code.
     kOther
   };
 
@@ -2878,8 +2877,6 @@ class Code : public Object {
   // Aborts if there is no static call at 'pc'.
   void SetStaticCallTargetCodeAt(uword pc, const Code& code) const;
 
-  void Disassemble() const;
-
   class Comments : public ZoneAllocated {
    public:
     static Comments& New(intptr_t count);
@@ -2967,7 +2964,6 @@ class Code : public Object {
   uword GetLazyDeoptPc() const;
 
   uword GetPcForDeoptId(intptr_t deopt_id, PcDescriptors::Kind kind) const;
-  intptr_t GetDeoptIdForOsr(uword pc) const;
 
   // Returns true if there is an object in the code between 'start_offset'
   // (inclusive) and 'end_offset' (exclusive).