Stefan Krah added the comment:
System: Windows 7 64-bit
Build (unpatched): PCBuild\Win32-pgo\python.exe, trained with profile.bat
In the unpatched version, I stepped through this test case in the debugger:
import array
a = array.array('Q', [1])
m = memoryview(a)
m[0] = 1
At Objects/memoryobject.c:1572: llu == 1
At Objects/memoryobject.c:1782: pylong_as_llu returned value 4294967296
So I think it's pretty safe to say that this is indeed an optimizer bug.
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<http://bugs.python.org/issue15993>
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