Mark Rousskov b98633b94c Store callbacks in global statics ...

The callbacks have precisely two states: the default, and the one
present throughout almost all of the rustc run (the filled in value
which has access to TyCtxt).

We used to store this as a thread local, and reset it on each thread to
the non-default value. But this is somewhat wasteful, since there is no
reason to set it globally -- while the callbacks themselves access TLS,
they do not do so in a manner that fails in when we do not have TLS to
work with.

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..

build.rs

Locate rustc binary similarly to codegen backend loading

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callbacks.rs

Store callbacks in global statics

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Cargo.toml

rustc: Link LLVM directly into rustc again

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interface.rs

Format the world

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lib.rs

Store callbacks in global statics

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passes.rs

Format the world

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proc_macro_decls.rs

Format the world

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queries.rs

Format the world

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tests.rs

Format the world

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util.rs

Store callbacks in global statics

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