Change the order of blocking in AllocateRegistersLocally.
Change the order of blocking in AllocateRegistersLocally.

Programmer is free to specify any register as a fixed RegisterLocation even one outside of the range available to the allocator itself.

BUG=

Review URL: https://codereview.chromium.org//13963009

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@21577 260f80e4-7a28-3924-810f-c04153c831b5

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