Add inline annotations and avoid 128-bit where it's not needed in TryFrom + tests for xsize/x128#43194

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oyvindln wants to merge 4 commits intorust-lang:masterfrom

oyvindln:tryfrom_avoid_128

Commits on Jul 12, 2017

Add inline annotations and avoid 128-bit where it's not needed in TryFrom
oyvindln
committed

Commits on Jul 13, 2017

Add bit width specific impls, add check for unknown bit width +
oyvindln
committed

Commits on Jul 14, 2017

Enable compile error feature
oyvindln
committed

Commits on Jul 15, 2017

Add tryfrom tests for xsize/x128, add some missed impls, slightly more readable
oyvindln
committed