[builtins] Start refactoring the Apply builtin.

src/mips64/macro-assembler-mips64.h

Index: src/mips64/macro-assembler-mips64.h
diff --git a/src/mips64/macro-assembler-mips64.h b/src/mips64/macro-assembler-mips64.h
index 509d9fde977a83cf9f69214f3b351ca83a7ae653..919b9658b0aa29e4563d87a26d7aef64087ef914 100644
--- a/src/mips64/macro-assembler-mips64.h
+++ b/src/mips64/macro-assembler-mips64.h
@@ -1692,6 +1692,9 @@ 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);