[clang] [clang][AST] Handle dependent representation of call to function with explicit object parameter in CallExpr::getBeginLoc() (PR #126868)

[Younan Zhang via cfe-commits]

================
@@ -1648,8 +1648,11 @@ SourceLocation CallExpr::getBeginLoc() const {
   if (const auto *Method =
           dyn_cast_if_present<const CXXMethodDecl>(getCalleeDecl());
       Method && Method->isExplicitObjectMemberFunction()) {
-    assert(getNumArgs() > 0 && getArg(0));
-    return getArg(0)->getBeginLoc();
+    if (!isTypeDependent()) {
+      assert(getNumArgs() > 0 && getArg(0));
+      if (getNumArgs() > 0 && getArg(0))
----------------
zyn0217 wrote:

```suggestion
      bool HasFirstArgument = getNumArgs() > 0 && getArg(0);
      assert(HasFirstArgument);
      if (HasFirstArgument)
```

https://github.com/llvm/llvm-project/pull/126868
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