Unify deoptimizer for JavaScript frames.

src/x64/frames-x64.cc

Index: src/x64/frames-x64.cc
diff --git a/src/x64/frames-x64.cc b/src/x64/frames-x64.cc
index 1d6adfdc21b55db80e58d66694a44e2fa0417721..a811a34ba963f0c81409fb2e563c92ac9be785da 100644
--- a/src/x64/frames-x64.cc
+++ b/src/x64/frames-x64.cc
@@ -43,6 +43,10 @@ Address ExitFrame::ComputeStackPointer(Address fp) {
 }
 
 
+Register JavaScriptFrame::fp_register() { return rbp; }
+Register JavaScriptFrame::context_register() { return rsi; }
+
+
 Register StubFailureTrampolineFrame::fp_register() { return rbp; }
 Register StubFailureTrampolineFrame::context_register() { return rsi; }