Fix missing setter for RecordKind.

The record kind (struct, class or union) was not being set while
converting from protobuf to IR.

Test: tests/test.py, all tests pass. Without the change, the default
      kind of a C record would have shown up as class_kind.

Change-Id: I507581211a6d30c2c51414c6fab6413eece6b458
10 files changed