[time-trace] Add optimizer and codegen regions to NPM

Optimizer and codegen regions were only added to legacy PM. Add
them to NPM as well.

Differential Revision: https://reviews.llvm.org/D117605

clang/lib/CodeGen/BackendUtil.cpp

@@ -1492,8 +1492,11 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
   }
 
   // Now that we have all of the passes ready, run them.
-  PrettyStackTraceString CrashInfo("Optimizer");
-  MPM.run(*TheModule, MAM);
+  {
+    PrettyStackTraceString CrashInfo("Optimizer");
+    llvm::TimeTraceScope TimeScope("Optimizer");
+    MPM.run(*TheModule, MAM);
+  }
 }
 
 void EmitAssemblyHelper::RunCodegenPipeline(
@@ -1525,8 +1528,11 @@ void EmitAssemblyHelper::RunCodegenPipeline(
     return;
   }
 
-  PrettyStackTraceString CrashInfo("Code generation");
-  CodeGenPasses.run(*TheModule);
+  {
+    PrettyStackTraceString CrashInfo("Code generation");
+    llvm::TimeTraceScope TimeScope("CodeGenPasses");
+    CodeGenPasses.run(*TheModule);
+  }
 }
 
 /// A clean version of `EmitAssembly` that uses the new pass manager.