[llvm] r294500 - [DebugInfo] Rename EmitDebugValue to EmitDebugThreadLocal (NFC)

[Simon Atanasyan via llvm-commits]

Hi David,

Commit message for the r294500 states that "As pointed out by David
Blaikie in the post commit review of r292624, EmitDebugValue should be
called EmitDebugThreadLocal".

After that commit the `DIEExpr::EmitValue` always calls the
`EmitDebugThreadLocal` for all architectures. Is it true that _any_
DIE expression is related to thread local storage on _all_
architectures?

Regards,
Simon