[ira] small patch to fix some IRA crashes on SH

[Vladimir Makarov]

The patch IRA crashes on some gcc tests for SH.
allocate_initial_values used reg info like NREFS (through a target
hook) which was not initialized at this point.

2008-04-09  Vladimir Makarov  <vmakarov@redhat.com>

	* ira.c (ira): Move allocate_initial_values after initializing reg
	info.

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