Correctly set kCanBeDivByZero flag for HMathFloorOfDiv.

test/mjsunit/regress/regress-171641.js

Index: test/mjsunit/regress/regress-171641.js
diff --git a/test/mjsunit/regress/regress-2499.js b/test/mjsunit/regress/regress-171641.js
similarity index 88%
copy from test/mjsunit/regress/regress-2499.js
copy to test/mjsunit/regress/regress-171641.js
index 52aad874db6fcdc89f5ee1ae4db45304e64b0e77..8db6781821325f8f6253eb2df4abb2b362b001c0 100644
--- a/test/mjsunit/regress/regress-2499.js
+++ b/test/mjsunit/regress/regress-171641.js
@@ -27,14 +27,14 @@
 
 // Flags: --allow-natives-syntax
 
-function foo(word, nBits) {
-  return (word[1] >>> nBits) | (word[0] << (32 - nBits));
+function foo(k, p) {
+  for (var i = 0; i < 1; i++) {
+    p = Math.min(p, i);
+  }
+  m = Math.floor((k | 0) / p);
 }
 
-word = [0x1001, 0];
-
-var expected = foo(word, 1);
-foo(word, 1);
+foo(0, 1);
+foo(0, 1);
 %OptimizeFunctionOnNextCall(foo);
-var optimized = foo(word, 1);
-assertEquals(expected, optimized)
+foo(0, 1);