[builtins] Provide Math.floor as TurboFan builtin.

src/compiler/typer.cc

 // Copyright 2014 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/compiler/typer.h"
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1567 matching lines @@
       return TypeUnaryOp(node, ObjectIsSmi);
     case Runtime::kInlineIsArray:
     case Runtime::kInlineIsDate:
     case Runtime::kInlineIsTypedArray:
     case Runtime::kInlineIsRegExp:
       return Type::Boolean();
     case Runtime::kInlineDoubleLo:
     case Runtime::kInlineDoubleHi:
       return Type::Signed32();
     case Runtime::kInlineConstructDouble:
-    case Runtime::kInlineMathFloor:
     case Runtime::kInlineMathAtan2:
       return Type::Number();
     case Runtime::kInlineMathClz32:
       return Type::Range(0, 32, zone());
     case Runtime::kInlineCreateIterResultObject:
     case Runtime::kInlineRegExpConstructResult:
       return Type::OtherObject();
     case Runtime::kInlineSubString:
     case Runtime::kInlineStringCharFromCode:
       return Type::String();
@@ skipping 869 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8