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

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index a9cd8f81f8097f3def6fe0bb8cde906f79bf61d1..1c7cecf90eb6313d82295cd536a3661a1c71d114 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -1474,6 +1474,15 @@
   __ And(at, scratch, Operand(1 << Map::kHasNonInstancePrototype));
   __ Branch(&slow_case, ne, at, Operand(zero_reg));
 
+  // Ensure that {function} is not bound.
+  Register const shared_info = scratch;
+  __ ld(shared_info,
+        FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+  __ lbu(scratch,
+         FieldMemOperand(shared_info, SharedFunctionInfo::kBoundByteOffset));
+  __ And(at, scratch, Operand(1 << SharedFunctionInfo::kBoundBitWithinByte));
+  __ Branch(&slow_case, ne, at, Operand(zero_reg));
+
   // Get the "prototype" (or initial map) of the {function}.
   __ ld(function_prototype,
         FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));