[PATCH] Enable ARM tail calls for ELF

[Tim Northover]

Hi,

The attached patch enables tail calls for every target that hasn't
explicitly been marked as bad (iOS < 5.0). This amounts to any ELF
target and being more liberal on some ghost MachO targets (e.g.
arm-apple-darwin9) that no-one probably cares about.

I think the ELF side is justified because the required linker support
is there in the ARM ELF specification so anywhere it doesn't work has
a broken linker. I've also tested it on Linux and our MCJIT dynamic
loader with no issues.

Does anyone object to the change?

Cheers.

Tim.
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