PPC: [compiler] Drop the CompareNilIC.

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 7fd6e2c7cd62ead7e8af5251cd218789812faedc..ca64aea1dbee8c7359a6972ffa81ac1d4cf570c4 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -3994,10 +3994,11 @@ void FullCodeGenerator::EmitLiteralCompareNil(CompareOperation* expr,
     __ cmp(r3, r4);
     Split(eq, if_true, if_false, fall_through);
   } else {
-    Handle<Code> ic = CompareNilICStub::GetUninitialized(isolate(), nil);
-    CallIC(ic, expr->CompareOperationFeedbackId());
-    __ CompareRoot(r3, Heap::kTrueValueRootIndex);
-    Split(eq, if_true, if_false, fall_through);
+    __ JumpIfSmi(r3, if_false);
+    __ LoadP(r3, FieldMemOperand(r3, HeapObject::kMapOffset));
+    __ lbz(r4, FieldMemOperand(r3, Map::kBitFieldOffset));
+    __ andi(r0, r4, Operand(1 << Map::kIsUndetectable));
+    Split(ne, if_true, if_false, fall_through, cr0);
   }
   context()->Plug(if_true, if_false);
 }