[turbofan] Some cleanup to the Typer.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 3169 matching lines @@
   HandleScope scope(isolate());
   Factory* factory = isolate()->factory();
 
   // The -0 value must be set before NewNumber works.
   set_minus_zero_value(*factory->NewHeapNumber(-0.0, IMMUTABLE, TENURED));
   DCHECK(std::signbit(minus_zero_value()->Number()) != 0);
 
   set_nan_value(*factory->NewHeapNumber(
       std::numeric_limits<double>::quiet_NaN(), IMMUTABLE, TENURED));
   set_infinity_value(*factory->NewHeapNumber(V8_INFINITY, IMMUTABLE, TENURED));
+  set_minus_infinity_value(
+      *factory->NewHeapNumber(-V8_INFINITY, IMMUTABLE, TENURED));
 
   // The hole has not been created yet, but we want to put something
   // predictable in the gaps in the string table, so lets make that Smi zero.
   set_the_hole_value(reinterpret_cast<Oddball*>(Smi::FromInt(0)));
 
   // Allocate initial string table.
   set_string_table(*StringTable::New(isolate(), kInitialStringTableSize));
 
   // Finish initializing oddballs after creating the string table.
   Oddball::Initialize(isolate(), factory->undefined_value(), "undefined",
@@ skipping 3612 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8