[PATCH] SubRegister Liveness fixups

[Matthias Braun]

Here is a set of patches that deal with some regressions in the ARM testsuite if subregister liveness tracking is enabled.

The regressions/differences are mostly due to:
* Different register allocation, less spills in some cases - as expected
* The scheduled changed in some tests - I'm not sure yet if that is fine or hints at a problem
* We cannot maintain implicit definitions for superregisters after register allocation anymore if subregister are written. This required a rewrite of the VMOV widening logic. One of the remaining regressions appears to be another case of missing implicit definitions prohibiting float domain-crossing logic to kick in.
* In some situations fewer kill flags are produced, in other situations more kill flags are produced - this is fine as Kill-flags are deprecated anyway, but a testcases needed to be adapted.


Greetings
    Matthias

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