Get symbol at location for class expressions/keywords (microsoft#26636)

* getSymbolAtLocation understands class expressions

Previously it did not.

* Update baselines

Author: sandersn

src/compiler/checker.ts

@@ -27269,6 +27269,7 @@ namespace ts {
                 case SyntaxKind.DefaultKeyword:
                 case SyntaxKind.FunctionKeyword:
                 case SyntaxKind.EqualsGreaterThanToken:
+                case SyntaxKind.ClassKeyword:
                     return getSymbolOfNode(node.parent);
                 case SyntaxKind.ImportType:
                     return isLiteralImportTypeNode(node) ? getSymbolAtLocation(node.argument.literal) : undefined;

tests/cases/fourslash/quickInfoClassKeyword.ts

@@ -0,0 +1,8 @@
+/// <reference path='fourslash.ts'/>
+
+////[1].forEach(cla/*1*/ss {});
+////[1].forEach(cla/*2*/ss OK{});
+
+verify.quickInfoAt("1", "(local class) (Anonymous class)");
+verify.quickInfoAt("2", "(local class) OK");
+

tests/cases/fourslash/quickInfoInvalidLocations.ts

@@ -8,7 +8,7 @@
 ////    property: string;
 /////*invalid2*/}
 ////
-////cl/*invalid3*/ass bar imple/*invalid4*/ments IFoo {
+////class bar imple/*invalid4*/ments IFoo {
 ////    constructor(   /*invalid5*/  ) {
 ////
 ////    }