Test indexed access to this on intersections (#40967)

* Added test.

* Accepted baselines.

Author: DanielRosenwasser

tests/baselines/reference/indexedAccessToThisTypeOnIntersection01.js

@@ -0,0 +1,9 @@
+//// [indexedAccessToThisTypeOnIntersection01.ts]
+interface A {
+  a: string;
+  getA: this['a'];
+}
+
+type T = (A & { a: number })['getA'];
+
+//// [indexedAccessToThisTypeOnIntersection01.js]

tests/baselines/reference/indexedAccessToThisTypeOnIntersection01.symbols

@@ -0,0 +1,16 @@
+=== tests/cases/compiler/indexedAccessToThisTypeOnIntersection01.ts ===
+interface A {
+>A : Symbol(A, Decl(indexedAccessToThisTypeOnIntersection01.ts, 0, 0))
+
+  a: string;
+>a : Symbol(A.a, Decl(indexedAccessToThisTypeOnIntersection01.ts, 0, 13))
+
+  getA: this['a'];
+>getA : Symbol(A.getA, Decl(indexedAccessToThisTypeOnIntersection01.ts, 1, 12))
+}
+
+type T = (A & { a: number })['getA'];
+>T : Symbol(T, Decl(indexedAccessToThisTypeOnIntersection01.ts, 3, 1))
+>A : Symbol(A, Decl(indexedAccessToThisTypeOnIntersection01.ts, 0, 0))
+>a : Symbol(a, Decl(indexedAccessToThisTypeOnIntersection01.ts, 5, 15))
+

tests/baselines/reference/indexedAccessToThisTypeOnIntersection01.types

@@ -0,0 +1,13 @@
+=== tests/cases/compiler/indexedAccessToThisTypeOnIntersection01.ts ===
+interface A {
+  a: string;
+>a : string
+
+  getA: this['a'];
+>getA : this["a"]
+}
+
+type T = (A & { a: number })['getA'];
+>T : never
+>a : number
+

tests/cases/compiler/indexedAccessToThisTypeOnIntersection01.ts

@@ -0,0 +1,6 @@
+interface A {
+  a: string;
+  getA: this['a'];
+}
+
+type T = (A & { a: number })['getA'];