X87: Write barrier for storing a code entry, and usage in CompileLazy builtin.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index efab3f789097ef3c5de5e148940d49c3647693a4..a51e951b0a45837e6997a8c688d568c4a9b6ab1d 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -107,6 +107,16 @@ class MacroAssembler: public Assembler {
     j(not_equal, if_not_equal, if_not_equal_distance);
   }
 
+  // These functions do not arrange the registers in any particular order so
+  // they are not useful for calls that can cause a GC.  The caller can
+  // exclude up to 3 registers that do not need to be saved and restored.
+  void PushCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg,
+                       Register exclusion2 = no_reg,
+                       Register exclusion3 = no_reg);
+  void PopCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1 = no_reg,
+                      Register exclusion2 = no_reg,
+                      Register exclusion3 = no_reg);
+
   // ---------------------------------------------------------------------------
   // GC Support
   enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd };
@@ -207,6 +217,11 @@ class MacroAssembler: public Assembler {
       PointersToHereCheck pointers_to_here_check_for_value =
           kPointersToHereMaybeInteresting);
 
+  // Notify the garbage collector that we wrote a code entry into a
+  // JSFunction. Only scratch is clobbered by the operation.
+  void RecordWriteCodeEntryField(Register js_function, Register code_entry,
+                                 Register scratch);
+
   // For page containing |object| mark the region covering the object's map
   // dirty. |object| is the object being stored into, |map| is the Map object
   // that was stored.