Paul Floyd 4b8eddfde1 Bug 445032 valgrind/memcheck crash with SIGSEGV when SIGVTALRM timer used and libthr.so associated
The problem was that 'struct sigframe' has both a uContext struct
member and a puContext pointer to that struct. And puContext wasn't
being initialized to point to uContext.

It seems that the pthread sigreturn code uses puContext on i386.
amd64, with register arguments, didn't have this problem.
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