Remove HTemporary when building the SSA graph.

- They are useless afterwards. If we keep them around, they can
  crash the dump of the graph, where they always assume a previous
  instruction.

- In the call to HTemporary::GetType, check that the previous
  instruction exists.

Change-Id: Ie7bf44d05cb61e3654a69725c1980925580dd3a6
3 files changed