message: Silence unhandled enums warning in ClangASTContext::GetEncoding
  The warning started firing after r333923, which added new builtin
  types (fixed point types) into clang.
  This patch merely silences the warning to unblock our integrate, does
  not aim to support the new types in lldb.
diff: @@ -4934,6 +4934,15 @@ lldb::Encoding ClangASTContext::GetEncoding(lldb::opaque_compiler_type_t type,
  case clang::BuiltinType::UInt128:
  return lldb::eEncodingUint;
  + // Fixed point types. Note that they are currently ignored.
  + case clang::BuiltinType::ShortAccum:
  + case clang::BuiltinType::Accum:
  + case clang::BuiltinType::LongAccum:
  + case clang::BuiltinType::UShortAccum:
  + case clang::BuiltinType::UAccum:
  + case clang::BuiltinType::ULongAccum:
  + break;
  +
  case clang::BuiltinType::Half:
  case clang::BuiltinType::Float:
  case clang::BuiltinType::Float16:
  