Turn Flags into a uint32_t typedef.

Turn Flags into a uint32_t typedef.

We cannot rely on C++ compilers inferring the int-type from the enum
value range. Whereas Linux/OSX find uint32_t as type for [0,MaxUInt32],
Windows insists it's int.

Update the test to execute its original intent on all platforms: 1 value
larger than max arguments, 1 smaller than max arguments (on all
platforms). This makes the test run a lot faster.

BUG=chromium:194749
Committed: https://code.google.com/p/v8/source/detail?r=13988

[Toon Verwaest, 2013-03-19 13:07:29]

PTAL

[Jakob Kummerow, 2013-03-19 13:08:56]

lgtm

[Toon Verwaest, 2013-03-19 13:11:57]

Committed patchset #1 manually as r13988 (presubmit successful).