Fix display of private names in language server

Signed-off-by: Joseph Watts <jwatts43@bloomberg.net>

Author: Joseph Watts

src/compiler/checker.ts

@@ -4408,7 +4408,10 @@ namespace ts {
                         context.flags ^= NodeBuilderFlags.InInitialEntityName;
                     }
                     let firstChar = symbolName.charCodeAt(0);
-                    const canUsePropertyAccess = isIdentifierStart(firstChar, languageVersion);
+                    const canUsePropertyAccess = firstChar === CharacterCodes.hash ?
+                        symbolName.length > 1 && isIdentifierStart(symbolName.charCodeAt(1), languageVersion) :
+                        isIdentifierStart(firstChar, languageVersion);
+
                     if (index === 0 || canUsePropertyAccess) {
                         const identifier = setEmitFlags(createIdentifier(symbolName, typeParameterNodes), EmitFlags.NoAsciiEscaping);
                         identifier.symbol = symbol;