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This makes them available to deferred calls, among others.
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This changes the compiler from treating calls to sync/atomic.* functions
as special calls (emitted directly at the call site) to actually
defining their declarations when there is no Go SSA implementation. And
rely on the inliner to inline these very small functions.
This works a bit better in practice. For example, this makes it possible
to use these functions in deferred function calls.
This commit is a bit large because it also needs to refactor a few
things to make it possible to define such intrinsic functions.
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This also implements DisableInterrupts/EnableInterrupts for RISC-V, as
those operations were needed to implement a few libcalls.
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