[PATCH] i386: do_test_wp_bit() must not be inlined

[PATCH] i386: do_test_wp_bit() must not be inlined

do_test_wp_bit() has a comment stating that it must not be inlined.
Unfortunately, the trick to prevent it from being inlined is not
reliable under gcc 4.x.

The simple fix consists in specifying the noinline attribute.
Tested and confirmed to produce the correct code for gcc versions
2.95.3, 3.3.6, 3.4.6, 4.0.2, 4.1.1 and 4.2.1.

Special thanks to Axel Reinhold and Richard Kojedzinszky for their
continuous feedback when trying to solve this issue.

Signed-off-by: Willy Tarreau <w@1wt.eu>