[clang][Interp][NFC] Fix a prototype argument name

Author: tbaederr

clang/lib/AST/Interp/Program.h

@@ -86,7 +86,7 @@ class Program final {
   std::optional<unsigned> getOrCreateDummy(const ValueDecl *VD);
 
   /// Creates a global and returns its index.
-  std::optional<unsigned> createGlobal(const ValueDecl *VD, const Expr *E);
+  std::optional<unsigned> createGlobal(const ValueDecl *VD, const Expr *Init);
 
   /// Creates a global from a lifetime-extended temporary.
   std::optional<unsigned> createGlobal(const Expr *E);