[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 1c7cecf90eb6313d82295cd536a3661a1c71d114..a9cd8f81f8097f3def6fe0bb8cde906f79bf61d1 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -1474,15 +1474,6 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
   __ 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));