[SILOptimizer] Add ctlz support to constant propagation #5519
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shajrawi
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radar rdar://problem/29004328
The Ctlz builtin is used by the new integer prototype. Since it is not constant folded, the value is computed dynamically. This in turn results in a more complex CFG.
This PR adds a peephole optimization for computing int_ctlz with constant arguments + adds test-cases to make sure it works