[PATCH][LoopStrengthReduce] Don't trim a formula that uses a subset of required registers

[Chandler Carruth]

On Mon, Apr 28, 2014 at 4:09 PM, Adam Nemet <anemet at apple.com> wrote:

> I’ll revert the test case until we investigate but clang does get
> substituted in test/lit.cfg.


What if you don't have Clang checked out?

This is just not the right way to test this. We need to have an IR test
case, not a C test case.
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