[turbofan] Also optimize unsigned division by constant.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 6b32258d111bdc277bce729b4b6324487654e051..1c169c23af666782745c10d4b0e2fe13528c05e3 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1606,7 +1606,7 @@ Bounds Typer::Visitor::TypeInt32Mul(Node* node) {
 
 
 Bounds Typer::Visitor::TypeInt32MulHigh(Node* node) {
-  return Bounds(Type::Integral32());
+  return Bounds(Type::Signed32());
 }
 
 
@@ -1650,6 +1650,11 @@ Bounds Typer::Visitor::TypeUint32Mod(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeUint32MulHigh(Node* node) {
+  return Bounds(Type::Unsigned32());
+}
+
+
 Bounds Typer::Visitor::TypeInt64Add(Node* node) {
   return Bounds(Type::Internal());
 }