[clang] [analyzer][NFC] Simplify BugType handling in core.BitwiseShift (PR #74609)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (DonatNagyE)

<details>
<summary>Changes</summary>

Eliminate the `mutable unique_ptr` hack because it's no longer needed. (This cleanup could be done anywhere, I'm doing it here now because it was me who published this checker with the old hack when it was already superfluous.)

---
Full diff: https://github.com/llvm/llvm-project/pull/74609.diff


1 Files Affected:

- (modified) clang/lib/StaticAnalyzer/Checkers/BitwiseShiftChecker.cpp (+2-6) 


``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/BitwiseShiftChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/BitwiseShiftChecker.cpp
index d4aa9fa1339f4..339927c165fe0 100644
--- a/clang/lib/StaticAnalyzer/Checkers/BitwiseShiftChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/BitwiseShiftChecker.cpp
@@ -344,7 +344,7 @@ BitwiseShiftValidator::createBugReport(StringRef ShortMsg, StringRef Msg) const
 } // anonymous namespace
 
 class BitwiseShiftChecker : public Checker<check::PreStmt<BinaryOperator>> {
-  mutable std::unique_ptr<BugType> BTPtr;
+  BugType BT{this, "Bitwise shift", "Suspicious operation"};
 
 public:
   void checkPreStmt(const BinaryOperator *B, CheckerContext &Ctx) const {
@@ -353,11 +353,7 @@ class BitwiseShiftChecker : public Checker<check::PreStmt<BinaryOperator>> {
     if (Op != BO_Shl && Op != BO_Shr)
       return;
 
-    if (!BTPtr)
-      BTPtr = std::make_unique<BugType>(this, "Bitwise shift",
-                                        "Suspicious operation");
-
-    BitwiseShiftValidator(B, Ctx, *BTPtr, Pedantic).run();
+    BitwiseShiftValidator(B, Ctx, BT, Pedantic).run();
   }
 
   bool Pedantic = false;

``````````

</details>


https://github.com/llvm/llvm-project/pull/74609