Passes: Consolidate EnableKnowledgeRetention declarations into a header file

llvm/include/llvm/Transforms/Utils/AssumeBundleBuilder.h

@@ -18,6 +18,7 @@
 
 #include "llvm/Analysis/AssumeBundleQueries.h"
 #include "llvm/IR/PassManager.h"
+#include "llvm/Support/CommandLine.h"
 
 namespace llvm {
 class AssumeInst;
@@ -26,6 +27,8 @@ class Instruction;
 class AssumptionCache;
 class DominatorTree;
 
+extern cl::opt<bool> EnableKnowledgeRetention;
+
 /// Build a call to llvm.assume to preserve informations that can be derived
 /// from the given instruction.
 /// If no information derived from \p I, this call returns null.

llvm/lib/Passes/PassBuilderPipelines.cpp

@@ -302,7 +302,6 @@ PipelineTuningOptions::PipelineTuningOptions() {
 
 namespace llvm {
 extern cl::opt<unsigned> MaxDevirtIterations;
-extern cl::opt<bool> EnableKnowledgeRetention;
 } // namespace llvm
 
 void PassBuilder::invokePeepholeEPCallbacks(FunctionPassManager &FPM,

llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -89,12 +89,6 @@ static cl::opt<unsigned> GuardWideningWindow(
     cl::desc("How wide an instruction window to bypass looking for "
              "another guard"));
 
-namespace llvm {
-/// enable preservation of attributes in assume like:
-/// call void @llvm.assume(i1 true) [ "nonnull"(i32* %PTR) ]
-extern cl::opt<bool> EnableKnowledgeRetention;
-} // namespace llvm
-
 /// Return the specified type promoted as it would be to pass though a va_arg
 /// area.
 static Type *getPromotedType(Type *Ty) {

llvm/unittests/Analysis/AssumeBundleQueriesTest.cpp

@@ -22,7 +22,6 @@ using namespace llvm;
 
 namespace llvm {
 extern cl::opt<bool> ShouldPreserveAllAttributes;
-extern cl::opt<bool> EnableKnowledgeRetention;
 } // namespace llvm
 
 static void RunTest(