[decompiler] ensure names starting with numbers are escaped

^ KTIJ-25985

analysis/decompiled/decompiler-to-psi/tests/org/jetbrains/kotlin/analysis/decompiler/psi/ByDecompiledPsiStubBuilderTestGenerated.java

@@ -246,6 +246,12 @@ public class ByDecompiledPsiStubBuilderTestGenerated extends AbstractByDecompile
         runTest("analysis/decompiled/decompiler-to-file-stubs/testData/clsFileStubBuilder/SecondaryConstructors/");
     }
 
+    @Test
+    @TestMetadata("SpecialNames")
+    public void testSpecialNames() throws Exception {
+        runTest("analysis/decompiled/decompiler-to-file-stubs/testData/clsFileStubBuilder/SpecialNames/");
+    }
+
     @Test
     @TestMetadata("SuspendLambda")
     public void testSuspendLambda() throws Exception {