LTTng 0.6.24 : compile fixes for ARM and MIPS.

Hi,

I modified the asm constraint for the markers so it would work for architectures
other than i386 (where the "m" constraint is ok). I use a "i" constraint on the
variable's address.

The goal is simply to make the compiler know that this static variable is used
without using the "used" attribute, as it is broken in some gcc versions.

Mathieu


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