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7a1b190bcd
This helps reduce the frequency of stack realignment prologues in 32-bit X86 Windows code. Before this change and the corresponding clang change, we would take the max of the type preferred alignment and the explicit alignment on the alloca. If you don't override aggregate alignment in datalayout, you get a default of 8. This dates back to 2007 / r34356, and changing it seems prohibitively difficult at this point. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236270 91177308-0d34-0410-b5e6-96231b3b80d8