Support unaligned load/store on more ARM targets

[Anton Korobeynikov]

> but it would be a useful tool to investigate alignment codegen issues.
> "strict-align" and "no-strict-align" seem natural, with defaults "no-strict"
> only on v6-darwin and v7-all.
"v7-darwin-and-linux", really. What if you use clang/llvm targeting
bare metal arm-eabi target?

--
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University