[AST] Fix getExprLoc reported for cxxDependentScopeMemberExpr

[steveire]

Summary

All other CallExpr use the location of the member name as the
getExprLoc:

https://godbolt.org/z/jx16G9Gdr

[steveire]

Update test

[steveire]

Fix windows build

clang/include/clang/AST/ExprCXX.h

public:
   }
 
   SourceLocation getEndLoc() const LLVM_READONLY {
     if (hasExplicitTemplateArgs())
       return getRAngleLoc();
     return MemberNameInfo.getEndLoc();
   }
 
+  SourceLocation getExprLoc() const LLVM_READONLY { return getMemberLoc(); }
+
   static bool classof(const Stmt *T) {
     return T->getStmtClass() == CXXDependentScopeMemberExprClass;
   }
 
   // Iterators
   child_range children() {
     if (isImplicitAccess())
       return child_range(child_iterator(), child_iterator());

clang/unittests/AST/SourceLocationTest.cpp

TEST(FriendDecl, FriendTemplateClassLocation) {
   Verifier.expectLocation(3, 14);
   EXPECT_TRUE(Verifier.match("struct A {\n"
                              "template <typename T>\n"
                              "friend class B;\n"
                              "};\n",
                              friendDecl()));
 }
 
+TEST(CXXDependentScopeMemberExpr, ExprLocation) {
+
+  llvm::Annotations Example(R"cpp(
+template<typename T>
+struct MyContainer
+{
+    template <typename U>
+    void pushBack();
+};
+
+template<typename T>
+void testCall()
+{
+  MyContainer<T> mc;
+  mc.template $member_name^pushBack<int>();
+}
+  )cpp");
+
+  auto AST = tooling::buildASTFromCodeWithArgs(
+      Example.code(), {"-fno-delayed-template-parsing"});
+  SourceManager &SM = AST->getSourceManager();
+  auto &Ctx = AST->getASTContext();
+
+  auto *M = selectFirst<CXXDependentScopeMemberExpr>(
+      "mem", match(cxxDependentScopeMemberExpr().bind("mem"), Ctx));
+  ASSERT_TRUE(M != nullptr);
+
+  ASSERT_EQ(SM.getFileOffset(M->getExprLoc()), Example.point("member_name"));
+}
+
 TEST(FriendDecl, FriendTemplateClassRange) {
   RangeVerifier<FriendDecl> Verifier;
   Verifier.expectRange(2, 1, 3, 14);
   EXPECT_TRUE(Verifier.match("struct A {\n"
                              "template <typename T>\n"
                              "friend class B;\n"
                              "};\n",
                              friendDecl()));