We don't pass classes with a copy-constructor or destructor byval, so the address takes up an integer register (if one is available). Make sure the x86-64 ABI implementation takes that into account properly.

The fixed implementation is compatible with the implementation both gcc and llvm-gcc use.

rdar://9686430 . (This is the issue that was reported in the thread "[LLVMdev] Segfault calling LLVM libs from a clang-compiled executable".)



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134059 91177308-0d34-0410-b5e6-96231b3b80d8

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