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On PPC/Darwin, byval arguments occur at fixed stack offsets in the callee's frame, but are not immutable -- the pointer value is directly available to the higher-level code as the address of the argument, and the value of the byval argument can be modified at the IR level. This is necessary, but not sufficient, to fix PR20280. When PR20280 is fixed in a follow-up commit, its test case will cover this change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215793 91177308-0d34-0410-b5e6-96231b3b80d8
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