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

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-modules

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

IndexFromEnd is already of int.


---
Full diff: https://github.com/llvm/llvm-project/pull/147204.diff


1 Files Affected:

- (modified) clang/lib/Serialization/ASTReader.cpp (+1-1) 


``````````diff
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];
   }
 }
 

``````````

</details>


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