[AArch64] Make StackTagging pass use alloca getAllocationSize rather than lifetime size#11970

DanBlackwell wants to merge 1 commit intoswiftlang:stable/21.xswiftlang/llvm-project:stable/21.xfrom

DanBlackwell:remove-lifetime-size-arg-stacktaggingDanBlackwell/llvm-project:remove-lifetime-size-arg-stacktaggingCopy head branch name to clipboard