[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

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 a37c11322cf6958cce81ef705a48faeb2da8352b..9fefbafeacf983ae306a0dca52d27622b9f5d270 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1476,6 +1476,10 @@ const Operand& rt = Operand(zero_reg), BranchDelaySlot bd = PROTECT
   // Abort execution if argument is not a JSFunction, enabled via --debug-code.
   void AssertFunction(Register object);
 
+  // Abort execution if argument is not a JSBoundFunction,
+  // enabled via --debug-code.
+  void AssertBoundFunction(Register object);
+
   // Abort execution if argument is not undefined or an AllocationSite, enabled
   // via --debug-code.
   void AssertUndefinedOrAllocationSite(Register object, Register scratch);