[turbofan] Remove int32 add/subtract narrowing during typed lowering.

test/mjsunit/regress/regress-unsigned-mul-add.js

Index: test/mjsunit/regress/regress-unsigned-mul-add.js
diff --git a/test/mjsunit/regress/regress-double-property.js b/test/mjsunit/regress/regress-unsigned-mul-add.js
similarity index 70%
copy from test/mjsunit/regress/regress-double-property.js
copy to test/mjsunit/regress/regress-unsigned-mul-add.js
index 2ddb45b4b66c79600c78abfaf5b64c1a9a13927a..0a2fc65017627f9c3588b34467657b4e9395cdb2 100644
--- a/test/mjsunit/regress/regress-double-property.js
+++ b/test/mjsunit/regress/regress-unsigned-mul-add.js
@@ -3,7 +3,8 @@
 // found in the LICENSE file.
 
 function f(a) {
-  return {0.1: a};
+  var x = a >>> 0;
+  return (x * 1.0 + x * 1.0) << 0;
 }
 
-f();
+assertEquals(-2, f(-1));