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b9e2588ce5
When taking the remainder of a value divided by a constant, visitREM() attempts to convert the REM to a longer but faster sequence of instructions. This conversion calls combine() on a speculative DIV instruction. Commit rL250825 may cause this combine() to return a DIVREM, corrupting nearby nodes. Flow eventually hits unreachable(). This patch adds a test case and a check to prevent visitREM() from trying to convert the REM instruction in cases where a DIVREM is possible. See http://reviews.llvm.org/D14035 llvm-svn: 251373
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