Optimize FrameState for large linear scripts (bug 591836, r=dmandelin).
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Remove FrameState::base (bug 591836 part 1, r=dmandelin).
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New register pinning invariants (bug 591836 part 2, r=dmandelin).
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Remove FrameState::tosFe() (bug 591836 part 3, r=dmandelin).
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New copy order invariant (bug 591836 part 4, r=dmandelin).
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Optimize immutable frame syncing (bug 591836 part 5, r=dmandelin).
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Optimize frame merging (bug 591836 part 6, r=dmandelin).
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Optimize copying frame entries (bug 591836 part 7, r=dmandelin).
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Optimize mutable frame syncing (bug 591836 part 8, r=dmandelin).
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Optimize syncing in try blocks (bug 591836 part 9, r=dmandelin).