[5.9][CSBindings] Mark type variables that represent type parameter packs … #65975
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…as "involving type variables"
Such type variables are always dependent on pack expansion type variables which should be bound first.
Scope: Expressions with value pack expansions.
Main Branch PR: [CSBindings] Mark type variables that represent type parameter packs as "involving type variables" #65962
Risk: Very Low
Reviewed By: @hborla
Testing: Added regression test-cases to the suite.
Resolves: rdar://109381194
(cherry picked from commit 5b5b3dd)
(cherry picked from commit ce826c2)
(cherry picked from commit 1728cca)