Revert of [runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index f3c8f253c1789deeec81a2eb3142ea9719f2c200..f1fce91c55b04a16d87a21eb9bcfaee4879b38cc 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -3858,18 +3858,6 @@
     CmpObjectType(object, JS_FUNCTION_TYPE, object);
     Pop(object);
     Check(equal, kOperandIsNotAFunction);
-  }
-}
-
-
-void MacroAssembler::AssertBoundFunction(Register object) {
-  if (emit_debug_code()) {
-    testb(object, Immediate(kSmiTagMask));
-    Check(not_equal, kOperandIsASmiAndNotABoundFunction);
-    Push(object);
-    CmpObjectType(object, JS_BOUND_FUNCTION_TYPE, object);
-    Pop(object);
-    Check(equal, kOperandIsNotABoundFunction);
   }
 }