[5.9][ConstraintSystem] Improvements to variadic generics inference #64820
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Cherry-pick of #64733
Cherry-pick of #64780
Explanation:
Scope: Calls to variadic generic functions with defaulted parameters, multiple variadic parameters and/or arguments that require conversions or l-value loading.
Main Branch PRs: [CSSimplify] Exploaded tuple argument should assume param's label if … #64733, [CSApply] Teach
coerceCallArguments
about variadic generics #64780Resolves: rdar://106775969
Risk: Low
Reviewed By: @hborla
Testing: Added a regression test-case to the suite.