Add used-before-declaration errors for class refs inside computed names (#23784)

src/compiler/checker.ts

@@ -1111,6 +1111,10 @@ namespace ts {
                     // still might be illegal if usage is in the initializer of the variable declaration (eg var a = a)
                     return !isImmediatelyUsedInInitializerOfBlockScopedVariable(declaration as VariableDeclaration, usage);
                 }
+                else if (isClassDeclaration(declaration)) {
+                    // still might be illegal if the usage is within a computed property name in the class (eg class A { static p = "a"; [A.p]() {} })
+                    return !findAncestor(usage, n => isComputedPropertyName(n) && n.parent.parent === declaration);
+                }
                 return true;
             }