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When we switch to opaque pointer types we will need some way to describe how many bytes a 'byval' parameter should occupy on the stack. This adds a (for now) optional extra type parameter. If present, the type must match the pointee type of the argument. Note to front-end maintainers: if this causes test failures, it's probably because the "byval" attribute is printed after attributes without any parameter after this change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362012 91177308-0d34-0410-b5e6-96231b3b80d8