[PATCH, ARM] Improve thumb2_extendXXdi2

[Richard Earnshaw]

This patch improves the code slightly for sign-extend to DImode when
compiling for thumb2.

R.

2009-05-31  Richard Earnshaw  <rearnsha@arm.com>

	* arm/thumb2.md (thumb2_extendsidi2): Add a split sub-pattern.
	(thumb2_extendqidi2): New pattern.


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