[PATCH] Make PrologEpilogInserter save/restore all callee saved registers in functions which call __builtin_unwind_init()

[Derek Schuff]

Attached is a patch which makes PEI::calculateCalleeSavedRegisters
save/restore all callee saved registers (even those which are not used) in
functions which call __builtin_unwind_init().
__builtin_unwind_init() is an undocumented gcc intrinsic which has this
effect, and is used in libgcc_eh.

This should fix PR8541.

I say "should" because I haven't yet investigated all the relevant details
of __builtin_eh_return, but it does fix some problems that we have seen
which are similar to that described in the bug.
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