[PowerPC] Alignment of toc-data symbol should not be increased during optimizations (#94593) Currently, the alignment of toc-data symbol might be changed during instcombine ``` IC: Visiting: %global = alloca %struct.widget, align 8 Found alloca equal to global: %global = alloca %struct.widget, align 8 memcpy = call void @llvm.memcpy.p0.p0.i64(ptr nonnull align 1 %global, ptr align 1 @global, i64 3, i1 false) ``` The `alloca` is created with `PrefAlign` which is 8 and after IC, the alignment of `@global` is enforced into `8`, same as the `alloca`. This is not expected, since toc-data symbol has the same alignment as toc entry and should not be increased during optimizations. --------- Co-authored-by: Sean Fertile <sd.fertile@gmail.com> Co-authored-by: Eli Friedman <efriedma@quicinc.com>
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