Adds up- and downgrade scripts for the support for type parameter
defaults.
In the upgrade direction we do nothing, matching the behaviour of
`getDefault` not having a result for old databases.
In the downgrade direction, we explicitly remove the relevant child (via
the `py_exprs` database relation) for `TypeVar`, `TypeVarTuple`, and
`ParamSpec` parameters.
Note that this still includes the somewhat puzzling parsing of
`Spam[**P2]` as an exponentiation with an empty left hand side. When we
fix that bug, we should also update this test to contain actually valid
syntax.
There was an errant `ql` in the relevant paths, a leftover from the move
from the internal repo. Also, we can no longer rely on an intree version
of the CodeQL CLI, so from now on we'll just assume it's present in the
path. (On Codespaces, `gh codeql` is a decent replacement, especially if
using the `install-stub` functionality.
Two new files -- alloc.h and array.h -- suddenly appeared. Presumably
they are used by the somewhat newer version of tree-sitter. To be safe,
I included them in this commit.
Specifically the disjunct for this.getPos() != -1. Running on
uber/aresdb, before we had this:
2403 ~1% {3} r6 = JOIN `DataFlowUtil::SummarizedParameterNode.getPos/0#dispred#70a2aab4` WITH `DataFlowPrivate::FlowSummaryNode.getSummarizedCallable/0#dispred#e79ea9be` ON FIRST 1 OUTPUT Lhs.1, Lhs.0, Rhs.1
9149774 ~5% {4} | JOIN WITH `Types::SignatureType.getParameterType/1#dispred#2c11bb7b_102#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Rhs.1, Lhs.1, Rhs.2
923 ~9% {2} | JOIN WITH `Scopes::Callable.getType/0#dispred#55a0e6a2` ON FIRST 2 OUTPUT Lhs.2, Lhs.3
We add a binding pragma to make it not bind on this.getPos() until
necessary. After we have this:
2403 ~0% {3} r6 = JOIN `DataFlowUtil::SummarizedParameterNode.getPos/0#dispred#70a2aab4` WITH `DataFlowPrivate::FlowSummaryNode.getSummarizedCallable/0#dispred#e79ea9be` ON FIRST 1 OUTPUT Rhs.1, Lhs.0, Lhs.1
2373 ~0% {3} | JOIN WITH `Scopes::Callable.getType/0#dispred#55a0e6a2` ON FIRST 1 OUTPUT Rhs.1, Lhs.2, Lhs.1
923 ~9% {2} | JOIN WITH `Types::SignatureType.getParameterType/1#dispred#2c11bb7b` ON FIRST 2 OUTPUT Lhs.2, Rhs.2
