[NewPM][opt] Share -disable-loop-unrolling between pass managers

There's no reason to introduce a new option for the NPM.
The various PGO options are shared in this manner.

Reviewed By: echristo

Differential Revision: https://reviews.llvm.org/D83368

llvm/test/Transforms/LoopUnroll/FullUnroll.ll

@@ -1,4 +1,4 @@
-; RUN: opt -passes='default<O1>' -disable-verify --mtriple x86_64-pc-linux-gnu -new-pm-disable-loop-unrolling=true \
+; RUN: opt -passes='default<O1>' -disable-verify --mtriple x86_64-pc-linux-gnu -disable-loop-unrolling=true \
 ; RUN: -S -o - %s | FileCheck %s
 
 ; This checks that the loop full unroller will fire in the new pass manager

llvm/tools/opt/NewPMDriver.cpp

@@ -102,9 +102,7 @@ static cl::opt<std::string> OptimizerLastEPPipeline(
     cl::Hidden);
 
 // Individual pipeline tuning options.
-static cl::opt<bool> DisableLoopUnrolling(
-    "new-pm-disable-loop-unrolling",
-    cl::desc("Disable loop unrolling in all relevant passes"), cl::init(false));
+extern cl::opt<bool> DisableLoopUnrolling;
 
 extern cl::opt<PGOKind> PGOKindFlag;
 extern cl::opt<std::string> ProfileFile;

llvm/tools/opt/opt.cpp

@@ -183,10 +183,9 @@ CodeGenOptLevel("codegen-opt-level",
 static cl::opt<std::string>
 TargetTriple("mtriple", cl::desc("Override target triple for module"));
 
-static cl::opt<bool>
-DisableLoopUnrolling("disable-loop-unrolling",
-                     cl::desc("Disable loop unrolling in all relevant passes"),
-                     cl::init(false));
+cl::opt<bool> DisableLoopUnrolling(
+    "disable-loop-unrolling",
+    cl::desc("Disable loop unrolling in all relevant passes"), cl::init(false));
 
 static cl::opt<bool> EmitSummaryIndex("module-summary",
                                       cl::desc("Emit module summary index"),