Change setDiagnosticsOutputFile to take a unique_ptr from a raw pointer (NFC)

Summary:
This makes it explicit that ownership is taken. Also replace all `new`
with make_unique<> at call sites.

Reviewers: anemet

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D26884

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@287449 91177308-0d34-0410-b5e6-96231b3b80d8

Author: joker-eph

Diff for: lib/CodeGen/CodeGenAction.cpp

@@ -195,7 +195,8 @@ namespace clang {
           return;
         }
 
-        Ctx.setDiagnosticsOutputFile(new yaml::Output(OptRecordFile->os()));
+        Ctx.setDiagnosticsOutputFile(
+            llvm::make_unique<yaml::Output>(OptRecordFile->os()));
 
         if (CodeGenOpts.getProfileUse() != CodeGenOptions::ProfileNone)
           Ctx.setDiagnosticHotnessRequested(true);