Clarify pointer ownership semantics by hoisting the std::unique_ptr creation to the caller instead of hiding it in emitReport. NFC.

llvm-svn: 240400
diff --git a/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
index cceffef..80384bb 100644
--- a/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/VLASizeChecker.cpp
@@ -72,10 +72,10 @@
     break;
   }
 
-  BugReport *report = new BugReport(*BT, os.str(), N);
+  auto report = llvm::make_unique<BugReport>(*BT, os.str(), N);
   report->addRange(SizeE->getSourceRange());
   bugreporter::trackNullOrUndefValue(N, SizeE, *report);
-  C.emitReport(report);
+  C.emitReport(std::move(report));
   return;
 }