PPC: [turbofan] Desugar JSUnaryNot(x) to Select(x, false, true).

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 347294916882018ccc31b51603a7c3ac8d35156f..c460926d1fb98af606dbfc9e3434523d517b0ee1 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -648,8 +648,8 @@ void FullCodeGenerator::DoTest(Expression* condition, Label* if_true,
                                Label* if_false, Label* fall_through) {
   Handle<Code> ic = ToBooleanStub::GetUninitialized(isolate());
   CallIC(ic, condition->test_id());
-  __ cmpi(result_register(), Operand::Zero());
-  Split(ne, if_true, if_false, fall_through);
+  __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+  Split(eq, if_true, if_false, fall_through);
 }
 
 
@@ -2030,8 +2030,8 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       CallLoadIC(NOT_INSIDE_TYPEOF);  // r0=result.done
       Handle<Code> bool_ic = ToBooleanStub::GetUninitialized(isolate());
       CallIC(bool_ic);
-      __ cmpi(r3, Operand::Zero());
-      __ beq(&l_try);
+      __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+      __ bne(&l_try);
 
       // result.value
       __ pop(load_receiver);                                 // result