[Bug testsuite/18154] let's be more forgiving on ppc64le

[mjw at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18154

--- Comment #3 from Mark Wielaard <mjw at redhat dot com> ---
(In reply to David Smith from comment #1)
> This looks like an instance of bug #16596 (Support DW_OP_GNU_entry_value in
> location expressions). We probably need to get Mark to look at this and see
> what he can find.

I am not sure prologue searching is such a good idea. I haven't analyzed many
cases yet. But at least for asmlink functions it seems -P causes us to put a
probe "too late". When we don't probe at the function start there is a
probability of the code already having clobbered the registers that hold the
function arguments. In which case we are too late and all DWARF gives us is a
location description using DW_OP_GNU_entry_value. Basically telling us that the
value is only available earlier.

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