Ensure instantiation expressions have symbols, preventing crash in signature relations (#56064)

tests/cases/compiler/aliasInstantiationExpressionGenericIntersectionNoCrash1.ts

@@ -0,0 +1,12 @@
+// @strict: true
+
+class ErrImpl<E> {
+  e!: E;
+}
+
+declare const Err: typeof ErrImpl & (<T>() => T);
+
+type ErrAlias<U> = typeof Err<U>;
+
+declare const e: ErrAlias<number>;
+e as ErrAlias<string>;

tests/cases/compiler/aliasInstantiationExpressionGenericIntersectionNoCrash2.ts

@@ -0,0 +1,17 @@
+// @strict: true
+
+declare class Class<T> {
+  x: T;
+}
+
+declare function fn<T>(): T;
+
+
+type ClassAlias<T> = typeof Class<T>;
+type FnAlias<T> = typeof fn<T>;
+
+type Wat<T> = ClassAlias<T> & FnAlias<T>;
+
+
+declare const wat: Wat<number>;
+wat as Wat<string>;