[crankshaft] Fix invalid number truncation assumption on HAdd inputs.

test/mjsunit/compiler/regress-5074.js

Index: test/mjsunit/compiler/regress-5074.js
diff --git a/test/mjsunit/regress/regress-3650-3.js b/test/mjsunit/compiler/regress-5074.js
similarity index 56%
copy from test/mjsunit/regress/regress-3650-3.js
copy to test/mjsunit/compiler/regress-5074.js
index 013e4df2834e20435982300303eb6260eb41b2be..903b54ad980042d134428d1c9be329499530cdef 100644
--- a/test/mjsunit/regress/regress-3650-3.js
+++ b/test/mjsunit/compiler/regress-5074.js
@@ -4,14 +4,15 @@
 
 // Flags: --allow-natives-syntax
 
-function foo(a) {
-  for (var d in a) {
-    delete a[1];
-  }
+var s = [,0.1];
+
+function foo(a, b) {
+  var x = s[a];
+  s[1] = 0.1;
+  return x + b;
 }
 
-foo([1,2,3]);
-foo([2,3,4]);
+assertEquals(2.1, foo(1, 2));
+assertEquals(2.1, foo(1, 2));
 %OptimizeFunctionOnNextCall(foo);
-foo([1,2,3]);
-assertOptimized(foo);
+assertEquals("undefined2", foo(0, "2"));