Suspicious segfault since #668

[tkf]

We thought the segmentation faults in #668's CI were some temporary bug in Julia nightly. However, I just noticed that it happens with Julia 1.0.3 as well:

signal (11): Segmentation fault
in expression starting at /home/travis/build/JuliaPy/PyCall.jl/test/runtests.jl:29
_ZNK4llvm4Type18isSizedDerivedTypeEPNS_15SmallPtrSetImplIPS0_EE at /home/travis/julia/bin/../lib/julia/libLLVM-6.0.so (unknown line)
_ZN4llvm12InstCombiner12visitBitCastERNS_11BitCastInstE at /home/travis/julia/bin/../lib/julia/libLLVM-6.0.so (unknown line)
...

--- https://travis-ci.org/JuliaPy/PyCall.jl/jobs/510151180#L804 from v1.91.0 tag
(also https://travis-ci.org/JuliaPy/PyCall.jl/jobs/510149760#L793 from master branch)

[stevengj]

Those errors went away in #668 after I added a GC.@protect in the PyArray{PyPtr} -> Array{PyObject} conversion, IIRC? Are you seeing them on the current master anywhere?

[tkf]

The CI results I linked above are from the build for v1.91.0 and master. Both for the commit 33f07eb.

[stevengj]

I committed your workaround from JuliaLang/julia#31473

[stevengj]

Tagged 1.91.1 with fix.