This commit fixes a compile error happening on Clang when building the
generic gchelper code for AArch32.
Clang would raise a warning regarding undefined variable access when
aliasing a variable to an existing CPU register. The fix is pretty
crude but it works - it simply disables the warning in question for the
AArch32 gchelper collection function. Care was taken to make sure the
code would also compile on GCC without warnings of sorts.
Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
5784714f73