[clang][Interp][NFC] Apply some clang-tidy suggestions

Remove unused includes and don't use an else after a return.

Author: tbaederr

clang/lib/AST/Interp/InterpFrame.h

@@ -15,8 +15,6 @@
 
 #include "Frame.h"
 #include "Program.h"
-#include <cstdint>
-#include <vector>
 
 namespace clang {
 namespace interp {
@@ -85,11 +83,9 @@ class InterpFrame final : public Frame {
   /// Returns the value of an argument.
   template <typename T> const T &getParam(unsigned Offset) const {
     auto Pt = Params.find(Offset);
-    if (Pt == Params.end()) {
+    if (Pt == Params.end())
       return stackRef<T>(Offset);
-    } else {
-      return Pointer(reinterpret_cast<Block *>(Pt->second.get())).deref<T>();
-    }
+    return Pointer(reinterpret_cast<Block *>(Pt->second.get())).deref<T>();
   }
 
   /// Mutates a local copy of a parameter.