CodeGen: Recreate old ivs with the original type
To avoid overflows we still use a larger type (i64) while calculating the value of the old ivs. However, we truncate the result to the type of the old iv when providing it to the new code. A corresponding test case is added to the polly test suite. Also, a failing test case is fixed. This fixes PR12311. Contributed by: Tsingray Liu <tsingrayliu@gmail.com> llvm-svn: 153952
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