Reland of [debugger] do not restart frames that reference new.target for liveedit.

src/debug/x64/debug-x64.cc

Index: src/debug/x64/debug-x64.cc
diff --git a/src/debug/x64/debug-x64.cc b/src/debug/x64/debug-x64.cc
index 7935b1d9abd633121d8040f050dcecf7156b0e65..60f1cfd4cfd9b9c5e3a77218f34562f60760fe9f 100644
--- a/src/debug/x64/debug-x64.cc
+++ b/src/debug/x64/debug-x64.cc
@@ -127,13 +127,16 @@
   // Load context from the function.
   __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
+  // Clear new.target as a safety measure.
+  __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+
   // Get function code.
-  __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movp(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset));
-  __ leap(rdx, FieldOperand(rdx, Code::kHeaderSize));
+  __ movp(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(rbx, FieldOperand(rbx, SharedFunctionInfo::kCodeOffset));
+  __ leap(rbx, FieldOperand(rbx, Code::kHeaderSize));
 
   // Re-run JSFunction, rdi is function, rsi is context.
-  __ jmp(rdx);
+  __ jmp(rbx);
 }
 
 const bool LiveEdit::kFrameDropperSupported = true;