[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index ff9ef1a21ff6d6f930ac95fa7777e639cbaccd12..c21038766865c3c4918da978bef1ec24dcabeb19 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -1612,7 +1612,6 @@ Type* Typer::Visitor::TypeJSCallRuntime(Node* node) {
     case Runtime::kInlineDoubleHi:
       return Type::Signed32();
     case Runtime::kInlineConstructDouble:
-    case Runtime::kInlineMathAtan2:
       return Type::Number();
     case Runtime::kInlineCreateIterResultObject:
     case Runtime::kInlineRegExpConstructResult:
@@ -1785,6 +1784,10 @@ Type* Typer::Visitor::TypeNumberFloor(Node* node) {
   return TypeUnaryOp(node, NumberFloor);
 }
 
+Type* Typer::Visitor::TypeNumberAtan(Node* node) { return Type::Number(); }
+
+Type* Typer::Visitor::TypeNumberAtan2(Node* node) { return Type::Number(); }
+
 Type* Typer::Visitor::TypeNumberLog(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberLog1p(Node* node) { return Type::Number(); }
@@ -2504,6 +2507,10 @@ Type* Typer::Visitor::TypeFloat64Abs(Node* node) {
   return Type::Number();
 }
 
+Type* Typer::Visitor::TypeFloat64Atan(Node* node) { return Type::Number(); }
+
+Type* Typer::Visitor::TypeFloat64Atan2(Node* node) { return Type::Number(); }
+
 Type* Typer::Visitor::TypeFloat64Log(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Log1p(Node* node) { return Type::Number(); }