X64: JSEntry Stub

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 61834e01ac2825dd2100bb7c1b74220d5beceb0c..4af372a81a3eae3ed4742337b15fab141467a42e 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -33,6 +33,9 @@
 namespace v8 {
 namespace internal {
 
+// Default scratch register used by MacroAssembler (and other code that needs
+// a spare register). The register isn't callee save, and not used by the
+// function calling convention.
 static const Register kScratchRegister = r10;
 
 // Forward declaration.
@@ -158,7 +161,7 @@ class MacroAssembler: public Assembler {
 
   // Push a new try handler and link into try handler chain.
   // The return address must be pushed before calling this helper.
-  // On exit, eax contains TOS (next_sp).
+  // On exit, rax contains TOS (next_sp).
   void PushTryHandler(CodeLocation try_location, HandlerType type);