[llvm] [InstCombine] Fix UB in align-assume check (PR #201985)

[Sudharsan Veeravalli via llvm-commits]

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@@ -210,6 +210,19 @@ define ptr @assume_align_16_via_align_metadata(ptr %p) {
   ret ptr %p2
 }
 
+define ptr @assume_align_6_via_align_metadata(ptr %p) {
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svs-quic wrote:

This test was initially added to test` Log2_64_Ceil` so that `RK.ArgValue` values that are not a pow-of-2 are handled. I now notice that we have a `!isPowerOf2_64(RK.ArgValue)`  on line `3676` so the values will always be a pow-of-2. Removing the test.

https://github.com/llvm/llvm-project/pull/201985