[PATCH] Fix APInt long division algorithm

[Yaron Keren]

REPOSITORY
  rL LLVM

================
Comment at: unittests/ADT/APIntTest.cpp:417
@@ +416,3 @@
+
+  auto p = a * b + c;
+  auto q = p.udiv(a);
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Please factor this code segment to a helper function, it's the same in divrem_big1, divrem_big2, divrem_big3, divrem_big5 and divrem_big6.

http://reviews.llvm.org/D9196

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