[turbofan] Add new Float32Abs and Float64Abs operators.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 1507f20dc8fd77d0dc3db9ae3afc8c4bfff2f8ce..ae8f14c9acdd5ce3f6c3b431e54491311c1b71a7 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -2134,6 +2134,12 @@ Bounds Typer::Visitor::TypeFloat32Min(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeFloat32Abs(Node* node) {
+  // TODO(turbofan): We should be able to infer a better type here.
+  return Bounds(Type::Number());
+}
+
+
 Bounds Typer::Visitor::TypeFloat32Sqrt(Node* node) {
   return Bounds(Type::Number());
 }
@@ -2189,6 +2195,12 @@ Bounds Typer::Visitor::TypeFloat64Min(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeFloat64Abs(Node* node) {
+  // TODO(turbofan): We should be able to infer a better type here.
+  return Bounds(Type::Number());
+}
+
+
 Bounds Typer::Visitor::TypeFloat64Sqrt(Node* node) {
   return Bounds(Type::Number());
 }