[builtins] Start refactoring the Apply builtin.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index e754a871286bbdeb027135a3ec09ad6496429733..3d5b4a261106a38442969e4f988b284df66265e6 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -521,6 +521,9 @@ class MacroAssembler: public Assembler {
   // Abort execution if argument is a smi, enabled via --debug-code.
   void AssertNotSmi(Register object);
 
+  // Abort execution if argument is not a FixedArray, enabled via --debug-code.
+  void AssertFixedArray(Register object);
+
   // Abort execution if argument is not a JSFunction, enabled via --debug-code.
   void AssertFunction(Register object);