[turbofan] Float32Constant/Float64Constant cannot occur in JS level graph.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 89a74ada893c744e2b46adacc5a7e886905d0a76..4f97772c8be20a0cb5b1553823d2abf749bab3f3 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -580,14 +580,14 @@ Type* Typer::Visitor::TypeRelocatableInt64Constant(Node* node) {
 }
 
 Type* Typer::Visitor::TypeFloat32Constant(Node* node) {
-  return Type::Intersect(Type::Of(OpParameter<float>(node), zone()),
-                         Type::UntaggedFloat32(), zone());
+  UNREACHABLE();
+  return nullptr;
 }
 
 
 Type* Typer::Visitor::TypeFloat64Constant(Node* node) {
-  return Type::Intersect(Type::Of(OpParameter<double>(node), zone()),
-                         Type::UntaggedFloat64(), zone());
+  UNREACHABLE();
+  return nullptr;
 }