[4.2][Refactoring] Fix crasher in switch with non-nominal subject type #18210
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rdar://problem/42098130
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rintaro
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Cherry-pick of #18177 reviewed by @nkcsgexi for swift-4.2-branch.
switchordefaultchecks if the subject type is "expandable" or not. Currently, this is limited to singleenumtype. Previously there was wrong assumption where subject type is always nominal type. But that is not true if the subject is, for example, tuple type.nullptrcheck where it should be.