So far, constant propagated arguments could only be builtin literals.
Now we support arbitrary structs (with constant arguments), e.g. `Int`.
This requires a small addition in the mangling scheme for function specializations.
Also, the de-mangling tree now looks a bit different to support a "tree" of structs and literals.
add `Test`, which is the SIL-equivalent of `FunctionTest`.
It's invocation closure gets a `TestContext` instead of a `FunctionContext`.
^ The commit message #2 will be skipped:
^ - test
This allows to move many SIL APIs and utilities, which require a context, to the SIL module.
The SIL-part of SwiftPassInvocation is extracted into a base class SILContext which now lives in SIL.
Also: simplify the begin/end-pass functions of the SwiftPassInvocation.
* add `cloneFunctionBody` without an `entryBlockArguments` argument
* remove the `swift::ClosureSpecializationCloner` from the bridging code and replace it with a more general `SpecializationCloner`
Originally this was a "private" utility for the ClosureSpecialization pass.
Now, make it a general utility which can be used for all kind of function specializations.
