[PATCH] add a function to translate subregister lane masks to other subregs.

[Matthias Braun]

Here’s the next part of my lane mask patches. This one adds a function to transform lane masks in a similar fashion like composeSubRegisterIndices does for sub registers.
I’m putting this here for an early review. It probably does not make too much sense committing this now before more of the subreg alloc work is finished.

Greetings,
	Matthias

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