Fix minifier to distinguish regexps from divisions (to some extent).

Rrraaa, I have to say, doing program rewriting via regexp rules is an inherently broken idea...

R=mstarzinger@chromium.org
BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9644001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10969 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/v8natives.js

@@ -1261,7 +1261,7 @@ function ObjectIsExtensible(obj) {
 // Harmony egal.
 function ObjectIs(obj1, obj2) {
   if (obj1 === obj2) {
-    return (obj1 !== 0) || ((1 / obj1) === (1 / obj2));
+    return (obj1 !== 0) || (1 / obj1 === 1 / obj2);
   } else {
     return (obj1 !== obj1) && (obj2 !== obj2);
   }

test/mjsunit/object-is.js

@@ -32,7 +32,7 @@ function TestEgal(expected, x, y) {
   assertSame(expected, Object.is(x, y));
 }
 
-var test_set = [ {}, [], 1/0, -1/0, "s", 0, 1/(-1/0), null, undefined ];
+var test_set = [ {}, [], 1/0, -1/0, "s", 0, 0/-1, null, undefined ];
 print(test_set);
 for (var i = 0; i < test_set.length; i++) {
   for (var j = 0; j < test_set.length; j++) {

tools/jsmin.py

@@ -232,7 +232,9 @@ class JavaScriptMinifier(object):
       # A regexp that matches a regexp literal surrounded by /slashes/.
       # Don't allow a regexp to have a ) before the first ( since that's a
       # syntax error and it's probably just two unrelated slashes.
-      slash_quoted_regexp = r"/(?:(?=\()|(?:[^()/\\]|\\.)+)(?:\([^/\\]|\\.)*/"
+      # Also don't allow it to come after anything that can only be the
+      # end of a primary expression.
+      slash_quoted_regexp = r"(?<![\w$'\")\]])/(?:(?=\()|(?:[^()/\\]|\\.)+)(?:\([^/\\]|\\.)*/"
       # Replace multiple spaces with a single space.
       line = re.sub("|".join([double_quoted_string,
                               single_quoted_string,