MIPS: Correctify instanceof and make it optimizable.

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 006f15b967db2067bedc0142bc3848ca6213e499..325c0feea1d8bd90a44c03dcff3a9aeb5aad425c 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -4273,34 +4273,8 @@ void MacroAssembler::GetMapConstructor(Register result, Register map,
 }
 
 
-void MacroAssembler::TryGetFunctionPrototype(Register function,
-                                             Register result,
-                                             Register scratch,
-                                             Label* miss,
-                                             bool miss_on_bound_function) {
-  Label non_instance;
-  if (miss_on_bound_function) {
-    // Check that the receiver isn't a smi.
-    JumpIfSmi(function, miss);
-
-    // Check that the function really is a function.  Load map into result reg.
-    GetObjectType(function, result, scratch);
-    Branch(miss, ne, scratch, Operand(JS_FUNCTION_TYPE));
-
-    ld(scratch,
-       FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    lwu(scratch,
-        FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
-    And(scratch, scratch,
-        Operand(1 << SharedFunctionInfo::kBoundFunction));
-    Branch(miss, ne, scratch, Operand(zero_reg));
-
-    // Make sure that the function has an instance prototype.
-    lbu(scratch, FieldMemOperand(result, Map::kBitFieldOffset));
-    And(scratch, scratch, Operand(1 << Map::kHasNonInstancePrototype));
-    Branch(&non_instance, ne, scratch, Operand(zero_reg));
-  }
-
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Register scratch, Label* miss) {
   // Get the prototype or initial map from the function.
   ld(result,
      FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
@@ -4319,15 +4293,6 @@ void MacroAssembler::TryGetFunctionPrototype(Register function,
   // Get the prototype from the initial map.
   ld(result, FieldMemOperand(result, Map::kPrototypeOffset));
 
-  if (miss_on_bound_function) {
-    jmp(&done);
-
-    // Non-instance prototype: Fetch prototype from constructor field
-    // in initial map.
-    bind(&non_instance);
-    GetMapConstructor(result, result, scratch, scratch);
-  }
-
   // All done.
   bind(&done);
 }