[5.10][CSSimplify] Determine whether type is know Foundation entity in a safer way #68991
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Cherry-pick of #68964
Addresses a common source of crashes in 5.9
Instead of trying to get string representation of the type itself,
let's just get it based on the type name, which works well with
the list of types we have.
Scope: Based on the stacktrace - expressions with some generic types that do not satisfy contextual conformance requirements.
Main Branch PR: [CSSimplify] Determine whether type is know Foundation entity in a sa… #68964
Resolves: rdar://113675093
Risk: Low
Reviewed By: @hborla
Testing: No tests because this is a speculative fix.
Resolves: rdar://113675093
(cherry picked from commit b83a73d)