[OpenMP][MLIR]OMPEarlyOutliningPass removal

This patch removes the OMPEarlyOutliningPass as it is no longer required. The implicit map operand capture has now been moved to the PFT lowering stage.

Depends on #67318.

Author: TIFitis

flang/include/flang/Optimizer/Transforms/Passes.h

@@ -75,8 +75,6 @@ std::unique_ptr<mlir::Pass>
 createAlgebraicSimplificationPass(const mlir::GreedyRewriteConfig &config);
 std::unique_ptr<mlir::Pass> createPolymorphicOpConversionPass();
 
-std::unique_ptr<mlir::OperationPass<mlir::ModuleOp>>
-createOMPEarlyOutliningPass();
 std::unique_ptr<mlir::Pass> createOMPFunctionFilteringPass();
 std::unique_ptr<mlir::OperationPass<mlir::ModuleOp>>
 createOMPMarkDeclareTargetPass();

flang/include/flang/Optimizer/Transforms/Passes.td

@@ -318,18 +318,6 @@ def LoopVersioning : Pass<"loop-versioning", "mlir::func::FuncOp"> {
   let dependentDialects = [ "fir::FIROpsDialect" ];
 }
 
-def OMPEarlyOutliningPass
-    : Pass<"omp-early-target-outlining", "mlir::ModuleOp"> {
-  let summary = "Outlines all target ops into separate functions";
-  let description = [{
-    This pass outlines all omp.target operations into individual functions.
-    It is invoked in the front end after the initial FIR has been constructed.
-    This pass is only needed when compiling for the target device to prevent
-    the optimizer to perform transforms across target region boundaries.
-  }];
-  let constructor = "::fir::createOMPEarlyOutliningPass()";
-}
-
 def OMPMarkDeclareTargetPass
     : Pass<"omp-mark-declare-target", "mlir::ModuleOp"> {
   let summary = "Marks all functions called by an OpenMP declare target function as declare target";

flang/include/flang/Tools/CLOptions.inc

@@ -274,10 +274,8 @@ inline void createHLFIRToFIRPassPipeline(
 inline void createOpenMPFIRPassPipeline(
     mlir::PassManager &pm, bool isTargetDevice) {
   pm.addPass(fir::createOMPMarkDeclareTargetPass());
-  if (isTargetDevice) {
-    pm.addPass(fir::createOMPEarlyOutliningPass());
+  if (isTargetDevice)
     pm.addPass(fir::createOMPFunctionFilteringPass());
-  }
 }
 
 #if !defined(FLANG_EXCLUDE_CODEGEN)

flang/lib/Optimizer/Transforms/CMakeLists.txt

@@ -17,7 +17,6 @@ add_flang_library(FIRTransforms
   AddDebugFoundation.cpp
   PolymorphicOpConversion.cpp
   LoopVersioning.cpp
-  OMPEarlyOutlining.cpp
   OMPFunctionFiltering.cpp
   OMPMarkDeclareTarget.cpp
   VScaleAttr.cpp