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Reapply r131605. This time with a fix, which is to use NoFolder.

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I'm not sure this is quite ideal, but I can't really think of any better way to do it.

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of the comparison, so that the resulting expression is fully
normalized. This fixes PR9939.

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Original log entry:
Refactor getActionType and getTypeToTransformTo ; place all of the 'decision'
code in one place.

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code in one place.

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Start trying to make InstCombine preserve more debug info.  The idea here is to set the debug location on the IRBuilder, which will be then right location in most cases.  This should magically give many transformations debug locations, and fixing places which are missing a debug location will usually just means changing the code creating it to use the IRBuilder.

As an example, the change to InstCombineCalls catches a common case where a call to a bitcast of a function is rewritten.

Chris, does this approach look reasonable?

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format.

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rdar://problem/6945110

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Radar 9422775.

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