[llvm] Make target triple in TLII const reference

[davidgmbb]

This avoids making a copy whenever the function is being called with an argument coming from const& values returned from TM

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[nikic]

This avoids making a copy whenever the function is being called with an argument coming from const& values returned from TM

The change itself makes sense, but the PR description leaves me confused. Passing a Foo& to const Foo& should produce a compiler error, not an implicit copy, right?

[davidgmbb]

This avoids making a copy whenever the function is being called with an argument coming from const& values returned from TM

The change itself makes sense, but the PR description leaves me confused. Passing a Foo& to const Foo& should produce a compiler error, not an implicit copy, right?

Sorry, poor wording by me. I meant what you said. As it gives a compiler error, you are forced to make a copy in order to call the function when having a const reference to the target triple object.

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