[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index a1d9c41a561f9156cfc484c4278b0ebe8d7fd64c..3c02f9d1436a400732d758d893afeae18fa8fa79 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -5566,6 +5566,17 @@ void MacroAssembler::AssertFunction(Register object) {
 }
 
 
+void MacroAssembler::AssertBoundFunction(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    SmiTst(object, t8);
+    Check(ne, kOperandIsASmiAndNotABoundFunction, t8, Operand(zero_reg));
+    GetObjectType(object, t8, t8);
+    Check(eq, kOperandIsNotABoundFunction, t8, Operand(JS_BOUND_FUNCTION_TYPE));
+  }
+}
+
+
 void MacroAssembler::AssertUndefinedOrAllocationSite(Register object,
                                                      Register scratch) {
   if (emit_debug_code()) {