[swift-api-digester] Update for 'deinit' as a special name.

[jrose-apple]

Missed switch case from the #10965 series. Unbreaks the build after -Werror=switch.

[jrose-apple]

cc @atrick

@swift-ci Please smoke test and merge

[ahoppen]

Pretty much exactly the changes I just submitted as #11287.
Sorry, I didn't see the warning while running tests and don't usually build all targets. My fault.

[moiseev]

/Users/buildnode/jenkins/workspace/swift-PR-osx-smoke-test/branch-master/swift/tools/swift-api-digester/swift-api-digester.cpp:1099:28: error: no member named 'Deinit' in 'swift::DeclBaseName::Kind'
  case DeclBaseName::Kind::Deinit:
       ~~~~~~~~~~~~~~~~~~~~^
/Users/buildnode/jenkins/workspace/swift-PR-osx-smoke-test/branch-master/swift/tools/swift-api-digester/swift-api-digester.cpp:1096:16: error: enumeration value 'Destructor' not handled in switch [-Werror,-Wswitch]
  switch (name.getKind()) {
               ^
/Users/buildnode/jenkins/workspace/swift-PR-osx-smoke-test/branch-master/swift/tools/swift-api-digester/swift-api-digester.cpp:1096:16: note: add missing switch cases
  switch (name.getKind()) {
               ^
2 errors generated.

[jrose-apple]

Shoot. Alex can spell and I can't.

[jrose-apple]

@swift-ci Please smoke test and merge

[jrose-apple]

@swift-ci Please smoke test and merge

[atrick]

Merging without Linux, because I can.

[jrose-apple]

Thanks, Andy!