[PATCH] PR19137: Correct PRE handling of llvm.sadd.with.overflow followed by add.

[Erik Verbruggen]

When PRE finds a leader for a non-intrinsic (e.g. add), where that
leader is an intrinsic (e.g. llvm.sadd.with.overflow), and the basic
block for the non-intrinsic has multiple incoming edges, then do not
insert a phi-node, because the types will be different.

The previous version only/accidentally worked for 2 incoming edges. The
testcase is changed to test 3 edges.

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