[clang] [Serialization] Remove an unnecessarycast (NFC) (PR #147204)

[Kazu Hirata via cfe-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/147204

IndexFromEnd is already of int.


>From bf416ae0d374a15107b8e742660bd985a7d9b2d8 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 5 Jul 2025 17:57:13 -0700
Subject: [PATCH] [Serialization] Remove an unnecessarycast (NFC)

IndexFromEnd is already of int.
---
 clang/lib/Serialization/ASTReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 6e03de87e587d..cc2d2ea86ccb7 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -9682,7 +9682,7 @@ ModuleFile *ASTReader::getLocalModuleFile(ModuleFile &M, unsigned ID) const {
     // It's a prefix (preamble, PCH, ...). Look it up by index.
    int IndexFromEnd = static_cast<int>(ID >> 1);
     assert(IndexFromEnd && "got reference to unknown module file");
-    return getModuleManager().pch_modules().end()[-static_cast<int>(IndexFromEnd)];
+    return getModuleManager().pch_modules().end()[-IndexFromEnd];
   }
 }