Revert "Lazy deopt without code patching."

runtime/vm/instructions_x64.h

Index: runtime/vm/instructions_x64.h
diff --git a/runtime/vm/instructions_x64.h b/runtime/vm/instructions_x64.h
index 97c52e9a1fa8568d51fc3c1a2a545e4b064e4385..8f1c073eff200ba1c03c796485f9dd0c90989f53 100644
--- a/runtime/vm/instructions_x64.h
+++ b/runtime/vm/instructions_x64.h
@@ -66,6 +66,25 @@ template<class P> class InstructionPattern : public ValueObject {
 };
 
 
+// 5 byte call instruction.
+class ShortCallPattern : public InstructionPattern<ShortCallPattern> {
+ public:
+  explicit ShortCallPattern(uword pc) : InstructionPattern(pc) {}
+
+  void SetTargetAddress(uword new_target) const;
+
+  static int pattern_length_in_bytes() { return kLengthInBytes; }
+  static const int* pattern() {
+    static const int kCallPattern[kLengthInBytes] = {0xE8, -1, -1, -1, -1};
+    return kCallPattern;
+  }
+
+ private:
+  static const int kLengthInBytes = 5;
+  DISALLOW_COPY_AND_ASSIGN(ShortCallPattern);
+};
+
+
 class ReturnPattern : public InstructionPattern<ReturnPattern> {
  public:
   explicit ReturnPattern(uword pc) : InstructionPattern(pc) {}