* Remove apparently obsolete builtin functions.
- Remove s_to_u_checked_conversion and u_to_s_checked_conversion functions from builtin AST parsing, SIL/IR generation and from SIL optimisations.
* Remove apparently obsolete builtin functions - unit tests.
- Remove unit tests for SIL transformations relating to s_to_u_checked_conversion and u_to_s_checked_conversion builtin functions.
* Remove apparently obsolete builtin functions.
- Remove s_to_u_checked_conversion and u_to_s_checked_conversion functions from builtin AST parsing, SIL/IR generation and from SIL optimisations.
* Remove apparently obsolete builtin functions - unit tests.
- Remove unit tests for SIL transformations relating to s_to_u_checked_conversion and u_to_s_checked_conversion builtin functions.
`#assert` is a new static assertion statement that will let us write
tests for the new constant evaluation infrastructure that we are working
on. `#assert` works by lowering to a `Builtin.poundAssert` SIL
instruction. The constant evaluation infrastructure will look for these
SIL instructions, const-evaluate their conditions, and emit errors if
the conditions are non-constant or false.
This commit implements parsing, typechecking and SILGen for `#assert`.
In the included, test case, the optimization was sinking
releases past is_escaping_closure.
Rewrite the isBarrier logic to be conservative and define the
mayCheckRefCount property in SIL/InstructionUtils. Properties that may
need to be updated when SIL changes belong there.
Note that it is particularly bad behavior if the presence of access
markers in the code cause miscompiles unrelated to access enforcement.
Fixes <rdar://problem/45846920> TestFoundation, TestProcess, closure
argument passed as @noescape to Objective-C has escaped.
General case:
begin_access A
...
strong_release / release_value / destroy
end_access
The release instruction can be sunk below the end_access instruction,
This extends the lifetime of the released value, but, might allow us to
Mark the access scope as no nested conflict.
