C++ PATCH for c++/42837 (abi/packed1.C failure on strict aligment targets)

[Jason Merrill]

We were getting misaligned accesses because we were failing to set 
DECL_PACKED on the virtual table pointer in a packed class.  Fixed thus.

The test now passes on ia64-unknown-linux-gnu and 
hppa2.0-unknown-linux-gnu.  Regression tested on 
x86_64-unknown-linux-gnu, applied to trunk.

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