[turbofan] Add TruncateFloat32ToUint32 operator to Turbofan.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 1024f0a25dbafb0e7a3a5d5f8a3dfae2cf934a08..703a745c770e5867bbb200d9db4e6ff6ca1dde02 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2155,6 +2155,12 @@ Type* Typer::Visitor::TypeTruncateFloat32ToInt32(Node* node) {
 }
 
 
+Type* Typer::Visitor::TypeTruncateFloat32ToUint32(Node* node) {
+  return Type::Intersect(Type::Unsigned32(), Type::UntaggedIntegral32(),
+                         zone());
+}
+
+
 Type* Typer::Visitor::TypeTryTruncateFloat32ToInt64(Node* node) {
   return Type::Internal();
 }