Reapply: [IRGen] Emit lifetime intrinsics around temporary aggregate argument allocas

This reverts commit e26c24b8.

These temporaries are only used in the callee, and their memory can be
reused after the call is complete.

rdar://58552124

Link: https://github.com/llvm/llvm-project/issues/38157
Link: https://github.com/llvm/llvm-project/issues/41896
Link: https://github.com/llvm/llvm-project/issues/43598
Link: https://github.com/ClangBuiltLinux/linux/issues/39
Link: https://reviews.llvm.org/rGfafc6e4fdf3673dcf557d6c8ae0c0a4bb3184402

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D74094