Revert of [turbofan] Fix deoptimization of boolean bit constants. (pa…

…tchset #1 id:1 of https://codereview.chromium.org/2495243002/ )

Reason for revert:
Seems to break GC stress.

Original issue's description:
> [turbofan] Fix deoptimization of boolean bit constants.
>
> BUG=chromium:664490

TBR=bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:664490

Review-Url: https://codereview.chromium.org/2502613002
Cr-Commit-Position: refs/heads/master@{#40961}

src/compiler/code-generator.cc

@@ -858,18 +858,12 @@ void CodeGenerator::AddTranslationForOperand(Translation* translation,
           constant_object =
               handle(reinterpret_cast<Smi*>(constant.ToInt32()), isolate());
           DCHECK(constant_object->IsSmi());
-        } else if (type.representation() == MachineRepresentation::kBit) {
-          if (constant.ToInt32() == 0) {
-            constant_object = isolate()->factory()->false_value();
-          } else {
-            DCHECK_EQ(1, constant.ToInt32());
-            constant_object = isolate()->factory()->true_value();
-          }
         } else {
           // TODO(jarin,bmeurer): We currently pass in raw pointers to the
           // JSFunction::entry here. We should really consider fixing this.
           DCHECK(type == MachineType::Int32() ||
                  type == MachineType::Uint32() ||
+                 type.representation() == MachineRepresentation::kBit ||
                  type.representation() == MachineRepresentation::kWord32 ||
                  type.representation() == MachineRepresentation::kNone);
           DCHECK(type.representation() != MachineRepresentation::kNone ||

src/compiler/simplified-lowering.cc

@@ -1030,8 +1030,6 @@ class RepresentationSelector {
                      MachineRepresentation::kWord32 ||
                  machine_type.semantic() == MachineSemantic::kInt32 ||
                  machine_type.semantic() == MachineSemantic::kUint32);
-          DCHECK(machine_type.representation() != MachineRepresentation::kBit ||
-                 input_type->Is(Type::Boolean()));
           (*types)[i] = machine_type;
         }
       }