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Commit 32dc7249 authored by Meador Inge's avatar Meador Inge
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ADT: Correct APInt::getActiveWords for zero values 

PR15138 was opened because of a segfault in the Bitcode writer.
The actual issue ended up being a bug in APInt where calls to
APInt::getActiveWords returns a bogus value when the APInt value
is 0.  This patch fixes the problem by ensuring that getActiveWords
returns 1 for 0 valued APInts.

llvm-svn: 174641
parent b31d7136
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