[turbofan] Introduce optional Float64Min and Float64Max machine operators.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 9934741767140ae4fff9b878d5385edcb7c9c736..3f9b105a7133f47bf9ed6449432ba15dd3c620ac 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2066,6 +2066,16 @@ Bounds Typer::Visitor::TypeFloat64Mod(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeFloat64Max(Node* node) {
+  return Bounds(Type::Number());
+}
+
+
+Bounds Typer::Visitor::TypeFloat64Min(Node* node) {
+  return Bounds(Type::Number());
+}
+
+
 Bounds Typer::Visitor::TypeFloat64Sqrt(Node* node) {
   return Bounds(Type::Number());
 }