Properly handle byval arguments in getPointerDereferenceableBytes()

Summary:
For byval arguments, the number of dereferenceable bytes is equal to
the size of the pointee, not the pointer.

Reviewers: hfinkel, rnk

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D41305

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320939 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed