[clang][Interp][NFC] Return array element type in Pointer::getType()

This is irrelevant for the current tests, but makes sense and later
changes easier.

Author: tbaederr

clang/lib/AST/Interp/Pointer.h

@@ -212,7 +212,11 @@ class Pointer {
   }
 
   /// Returns the type of the innermost field.
-  QualType getType() const { return getFieldDesc()->getType(); }
+  QualType getType() const {
+    if (inPrimitiveArray() && Offset != Base)
+      return getFieldDesc()->getType()->getAsArrayTypeUnsafe()->getElementType();
+    return getFieldDesc()->getType();
+  }
 
   Pointer getDeclPtr() const { return Pointer(Pointee); }