[swiftc] Remove duplicate crash cases.

Definition of uniqueness:
* https://github.com/practicalswift/swift-compiler-crashes/blob/819d9a38241274874426cc7b406ff8121b7b6553/test.sh#L77-L90

Duplicates of 01793-swift-nominaltypedecl-getdeclaredtypeincontext.swift:
* 28210-swift-declcontext-getprotocolself.swift

Duplicates of 10659-swift-printingdiagnosticconsumer-handlediagnostic.timeout.swift:
* 28190-swift-conformancelookuptable-expandimpliedconformances.swift

Duplicates of 16694-swift-constraints-constraintsystem-opentype.swift:
* 28226-swift-iterativetypechecker-processinheritedprotocols.swift

Duplicates of 24394-swift-typevariabletype-implementation-getrepresentative.swift:
* 28228-swift-dependentgenerictyperesolver-resolveselfassociatedtype.swift

Duplicates of 26339-llvm-ondiskchainedhashtable-swift-modulefile-decltableinfo-find.swift:
* 01036-swift-modulefile-lookupvalue.swift
* 01879-swift-nominaltypedecl-getdeclaredtypeincontext.swift
* 01904-swift-type-transform.swift
* 01934-swift-typebase-gettypevariables.swift
* 02233-swift-constraints-constraintsystem-lookthroughimplicitlyunwrappedoptionaltype.swift
* 02242-swift-functiontype-get.swift
* 28303-swift-typechecker-checkgenericparamlist.swift
* 28304-swift-typechecker-checkgenericparamlist.swift
* 28307-swift-typechecker-resolveidentifiertype.swift
* 28308-swift-typechecker-checkgenericparamlist.swift
* 28310-swift-typechecker-checkgenericparamlist.swift
* 28311-swift-typechecker-checkgenericparamlist.swift
* 28312-swift-typechecker-checkgenericparamlist.swift
* 28313-swift-typechecker-checkgenericparamlist.swift
* 28314-swift-typechecker-checkgenericparamlist.swift

Duplicates of 26725-llvm-smallvectorimpl-swift-diagnosticargument-operator.swift:
* 28188-swift-removeoverriddendecls.timeout.swift
* 28215-swift-normalprotocolconformance-getwitness.swift
* 28255-swift-decl-dump.swift

Duplicates of 28212-swift-typechecker-resolvetypeincontext.swift:
* 28234-swift-archetypebuilder-getgenericsignature.swift

Duplicates of 28221-swift-typebase-getmembersubstitutions.swift:
* 28273-swift-archetypebuilder-potentialarchetype-gettype.swift

Duplicates of 28250-swift-typechecker-typecheckdecl.swift:
* 28238-swift-typechecker-validatedecl.swift

Duplicates of 28256-swift-typechecker-resolvetypewitness.swift:
* 28257-swift-typechecker-resolvetypewitness.swift

Duplicates of 28267-swift-typechecker-checkconformance.swift:
* 28222-swift-typechecker-checkconformance.swift

Duplicates of 28271-swift-archetypebuilder-getallarchetypes.swift:
* 25962-swift-archetypebuilder-getallarchetypes.swift

Duplicates of 28316-swift-typechecker-checkgenericparamlist.swift:
* 28305-swift-typechecker-checkgenericparamlist.swift

Author: practicalswift