[llvm] [CodeGen] Avoid aligning alloca size. (PR #132064)

[via llvm-commits]

jcogan-nv wrote:

cc @arsenm from the discourse thread: https://discourse.llvm.org/t/why-does-irtranslator-align-the-size-for-dynamic-alloca/85160

https://github.com/llvm/llvm-project/pull/132064