[llvm-dev] Tail calls and portability

[Demi Obenour via llvm-dev]

I have been working on adding proper tail (via `become`) to rustc.  I was
able to make them work (some parts of the type checker aren't implemented
yet).  However, I ran into an LLVM-related problem.

LLVM claims to support proper tail calls when fastcc is used — but only on
i386, x86-64 and PowerPC.  Is this accurate? Will proper tail calls be
supported on WebAssembly?  Are they supported on ARM? AArch64? Other
backends?
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