signal frames. This commit looks worse than it is -- really just a
load of moving-code-around.
This is the first multiple-implementation module, in that it has a
single interface (pub_core_sigframe.h) but multiple implementations,
depending on the os-cpu pair. All the grotty details are hidden in
the implementation in m_sigframe/; callers need be aware only of the
interface. Yay.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3556
