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

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index 3ac135c034891186b81b4b4558de911a9ab4f05a..34855694839dbf0ee5fd90210a36e5e3652920aa 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -3146,7 +3146,7 @@
   __ JumpIfSmi(v0, if_false);
   __ GetObjectType(v0, a1, a2);
   PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
-  __ Branch(if_true, hs, a2, Operand(FIRST_FUNCTION_TYPE));
+  __ Branch(if_true, eq, a2, Operand(JS_FUNCTION_TYPE));
   __ Branch(if_false);
 
   context()->Plug(if_true, if_false);