X87: [turbofan] Desugar JSUnaryNot(x) to Select(x, false, true).

  port 411c5b7f (r32524)

  original commit message:
  Also remove the ResultMode from ToBooleanStub and always return true or
  false and use the same mechanism in fullcodegen.  This is in preparation
  for adding ToBoolean hints to TurboFan.

  Drive-by-fix: We can use the power of the ToBooleanIC in TurboFan now
  that the ResultMode is gone (and the runtime always returns true or
  false from the miss handler).

BUG=

Review URL: https://codereview.chromium.org/1500483002

Cr-Commit-Position: refs/heads/master@{#32543}

src/full-codegen/x87/full-codegen-x87.cc

@@ -621,9 +621,8 @@ void FullCodeGenerator::DoTest(Expression* condition,
                                Label* fall_through) {
   Handle<Code> ic = ToBooleanStub::GetUninitialized(isolate());
   CallIC(ic, condition->test_id());
-  __ test(result_register(), result_register());
-  // The stub returns nonzero for true.
-  Split(not_zero, if_true, if_false, fall_through);
+  __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+  Split(equal, if_true, if_false, fall_through);
 }
 
 
@@ -1977,8 +1976,8 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       CallLoadIC(NOT_INSIDE_TYPEOF);  // result.done in eax
       Handle<Code> bool_ic = ToBooleanStub::GetUninitialized(isolate());
       CallIC(bool_ic);
-      __ test(eax, eax);
-      __ j(zero, &l_try);
+      __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+      __ j(not_equal, &l_try);
 
       // result.value
       __ pop(load_receiver);                              // result