Revert "Special case typing for Python < 3.5 (PY-22945)"

This reverts commit 891b423d16.

Don't disable resolve to typing because stubs would become useless.

python/src/com/jetbrains/python/codeInsight/typing/PyTypeShed.kt

@@ -57,11 +57,7 @@ object PyTypeShed {
       return false
     }
     if (isInStandardLibrary(root)) {
-      if (ApplicationManager.getApplication().isUnitTestMode ||
-          topLevelPackage != TYPING ||
-          PythonSdkType.getLanguageLevelForSdk(sdk).isAtLeast(LanguageLevel.PYTHON35)) {
         return true
-      }
     }
     if (isInThirdPartyLibraries(root)) {
       if (ApplicationManager.getApplication().isUnitTestMode) {

python/testSrc/com/jetbrains/python/PyTypeTest.java

@@ -2587,6 +2587,13 @@ public class PyTypeTest extends PyTestCase {
     );
   }
 
+  // PY-22945
+  public void testNotInstalledTypingUsedInAnalysis() {
+    doTest("Pattern[str]",
+                    "from re import compile\n" +
+                    "expr = compile(\"str\")");
+  }
+
   private static List<TypeEvalContext> getTypeEvalContexts(@NotNull PyExpression element) {
     return ImmutableList.of(TypeEvalContext.codeAnalysis(element.getProject(), element.getContainingFile()).withTracing(),
                             TypeEvalContext.userInitiated(element.getProject(), element.getContainingFile()).withTracing());