Eliminate unnecessary SwiftASTContext fallback in GetIndexOfChildMemb… #3889
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…erWithName().
Enums without payloads are not supposed to have children in the LLDB
data formatter sense, so GetIndexOfChildMemberWithName should return
0. However previously we couldn't distinguish between
SwiftLanguageRuntime failing to look up a type and a success where the
match was a non-payload enum member.