Add a matcher for the name of a DependentScopeDeclRefExpr

[HighCommander4]

In #120937 we added a new dependentScopeDeclRefExpr() matcher, for matching expression node of type DependentScopeDeclRefExpr.

To make this matcher more useful, it would be nice to have a matcher that can go inside dependentScopeDeclRefExpr() to narrow down the match to expressions referencing a particular name.

We have such a matcher for CXXDependentScopeMemberExpr, called hasMemberName(). I'm proposing we add something similar for DependentScopeDeclRefExpr.

We'll need to figure out what to name it. hasMemberName is not appropriate here, as DependentScopeDeclRefExpr does not necessarily name a class member. hasName sounds good but is already used for NamedDecl and I don't know how easy it would be to overload it. hasDependentName perhaps?

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Nathan Ridge (HighCommander4)

In https://github.com//issues/120937 we added a new `dependentScopeDeclRefExpr()` matcher, for matching expression node of type `DependentScopeDeclRefExpr`.

To make this matcher more useful, it would be nice to have a matcher that can go inside dependentScopeDeclRefExpr() to narrow down the match to expressions referencing a particular name.

We have such a matcher for CXXDependentScopeMemberExpr, called [hasMemberName()](https://searchfox.org/llvm/rev/f87a9db8322643ccbc324e317a75b55903129b55/clang/include/clang/ASTMatchers/ASTMatchers.h#3186-3208). I'm proposing we add something similar for DependentScopeDeclRefExpr.

We'll need to figure out what to name it. hasMemberName is not appropriate here, as DependentScopeDeclRefExpr does not necessarily name a class member. hasName sounds good but [is already used](https://searchfox.org/llvm/rev/f87a9db8322643ccbc324e317a75b55903129b55/clang/include/clang/ASTMatchers/ASTMatchers.h#3100) for NamedDecl and I don't know how easy it would be to overload it. hasDependentName perhaps?

[HighCommander4]

@AmrDeveloper you might find this an interesting follow-up to #120937 to work on.

[AmrDeveloper]

Cool, interested to work on it @HighCommander4, Thank you