RFC: Add __pointer_guard_t for pointer_guard

[Mike Frysinger]

On Thursday 17 May 2012 21:15:09 H.J. Lu wrote:
> on x32, PTR_DEMANGLE/PTR_MANGLE are used on 64-bit registers, which
> requires the pointer_guard field in tcbhead_t to be 64-bit. But
> uintptr_t is 32-bit on x32.  This patch adds __pointer_guard_t for
> pointer_guard and reorders tcbhead_t for x32.  By pure luck, stack_guard
> and __private_tm offsets used by GCC stay the same.  Any comments?

it's not possible to fix the asm code to work on 32bit values on x32 systems ?  
it kind of sucks we have to add a new type which is uintptr_t for most 
targets.
-mike
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