[builtins] Start refactoring the Apply builtin.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index d7378317cc8faa155d556a57738c691833809dc3..18a7cca336ec589b0c0fd2a7b839a438969356f1 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1538,6 +1538,9 @@ const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
   void AssertNotSmi(Register object);
   void AssertSmi(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);