[clang-tools-extra] [clang-include-fixer] Remove an unused "using" decl (NFC) (PR #140354)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-tools-extra

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

We do use MappingTraits in this file, but all uses are inside the
llvm::yaml namespace, so we don't rely on the "using" decl.


---
Full diff: https://github.com/llvm/llvm-project/pull/140354.diff


1 Files Affected:

- (modified) clang-tools-extra/clang-include-fixer/find-all-symbols/SymbolInfo.cpp (-1) 


``````````diff
diff --git a/clang-tools-extra/clang-include-fixer/find-all-symbols/SymbolInfo.cpp b/clang-tools-extra/clang-include-fixer/find-all-symbols/SymbolInfo.cpp
index 4a5f8353b4105..3ac3f73b6cb9a 100644
--- a/clang-tools-extra/clang-include-fixer/find-all-symbols/SymbolInfo.cpp
+++ b/clang-tools-extra/clang-include-fixer/find-all-symbols/SymbolInfo.cpp
@@ -12,7 +12,6 @@
 #include "llvm/Support/YAMLTraits.h"
 #include "llvm/Support/raw_ostream.h"
 
-using llvm::yaml::MappingTraits;
 using ContextType = clang::find_all_symbols::SymbolInfo::ContextType;
 using clang::find_all_symbols::SymbolInfo;
 using clang::find_all_symbols::SymbolAndSignals;

``````````

</details>


https://github.com/llvm/llvm-project/pull/140354