test_string.rb: enable huge test only on possible platforms

* test/ruby/test_string.rb (test_LSHIFT_neary_long_max): enable
  only on platforms where string size range is smaller than memory
  space.  this test does not make sense but just wastes memory and
  time on other platforms, as it is hardly possible that a string
  size becomes neary LONG_MAX if long size equals pointer size.
  [ruby-core:65410] [Bug #10325]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,12 @@
+Mon Oct  6 16:07:11 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* test/ruby/test_string.rb (test_LSHIFT_neary_long_max): enable
+	  only on platforms where string size range is smaller than memory
+	  space.  this test does not make sense but just wastes memory and
+	  time on other platforms, as it is hardly possible that a string
+	  size becomes neary LONG_MAX if long size equals pointer size.
+	  [ruby-core:65410] [Bug #10325]
+
 Mon Oct  6 11:21:21 2014  Martin Duerst <duerst@it.aoyama.ac.jp>
 
 	* tool/unicode_norm_gen.rb: Adding/tweaking comments.

test/ruby/test_string.rb

@@ -2270,7 +2270,8 @@ class TestString < Test::Unit::TestCase
       rescue NoMemoryError
       end
     end;
-  end
+  end if [0].pack("l!").bytesize < [nil].pack("p").bytesize
+  # enable only when string size range is smaller than memory space
 end
 
 class TestString2 < TestString