[DynInst_API:] ppcle detach removes snippets

[Stan Cox <scox@xxxxxxxxxx>]

The release folks have a smoke test which essentially does:
 insertSnippet
 continueExecution
 detach
This works fine on x8664 and aarch64 but not on a ppcle box (kernel-4.1 
8.0-112.el8 glibc-2.28-66.el8)
On ppcle there is no instrumented call to incr; the call to detach 
removes the instrumented call. If you add a waitForStatusChange before 
detach (or simply just sleep) then ppcle hits the snippet call to incr 
just fine.
Here is the example run:

./mutatee -v 10 & LD_LIBRARY_PATH=/usr/lib64/dyninst 
DYNINSTAPI_RT_LIB=/usr/lib64/dyninst/libdyninstAPI_RT.so ./mutator $!
[1] 106821
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
MUTATION DONE. MUTATOR IS GOING...
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 0

And the example run with waitForStatusChange added.  But that really 
should not be necessary as detach should not remove instrumentation, right?
FUNCTION EXECUTED. VALUE = 0
FUNCTION EXECUTED. VALUE = 1
FUNCTION EXECUTED. VALUE = 2
FUNCTION EXECUTED. VALUE = 3
FUNCTION EXECUTED. VALUE = 4
FUNCTION EXECUTED. VALUE = 5
FUNCTION EXECUTED. VALUE = 6
FUNCTION EXECUTED. VALUE = 7
FUNCTION EXECUTED. VALUE = 8
FUNCTION EXECUTED. VALUE = 9
MUTATION DONE. MUTATOR IS GOING...

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