cgo: set alignment to 1 for unions and classes; avoids crash from divide-by-zero Fixes issue 4114.
cgo: set alignment to 1 for unions and classes; avoids crash from divide-by-zero
Fixes issue 4114.

R=golang-dev, iant, rsc, iant, devon.odell
CC=golang-dev
http://codereview.appspot.com/6553050

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