[flang][fir] Small clean-up in fir_DoConcurrentLoopOp's defintion (#146028)

Re-organizes the op definition a little bit and removes a method that
does not add much value to the API.

PR stack:
- #145837
- #146025
- #146028 (this one)
- #146033

Author: ergawy

flang/include/flang/Optimizer/Dialect/FIROps.td

@@ -3878,9 +3878,17 @@ def fir_DoConcurrentLoopOp : fir_Op<"do_concurrent.loop",
   let hasVerifier = 1;
 
   let extraClassDeclaration = [{
-    unsigned getNumInductionVars() { return getLowerBound().size(); }
+    unsigned getNumInductionVars() {
+      return getLowerBound().size();
+    }
 
-    unsigned getNumLocalOperands() { return getLocalVars().size(); }
+    unsigned getNumLocalOperands() {
+      return getLocalVars().size();
+    }
+
+    unsigned getNumReduceOperands() {
+      return getReduceVars().size();
+    }
 
     mlir::Block::BlockArgListType getInductionVars() {
       return getBody()->getArguments().slice(0, getNumInductionVars());
@@ -3900,16 +3908,6 @@ def fir_DoConcurrentLoopOp : fir_Op<"do_concurrent.loop",
     /// Number of operands controlling the loop
     unsigned getNumControlOperands() { return getLowerBound().size() * 3; }
 
-    // Get Number of reduction operands
-    unsigned getNumReduceOperands() {
-      return getReduceVars().size();
-    }
-
-    mlir::Operation::operand_range getLocalOperands() {
-      return getOperands()
-          .slice(getNumControlOperands() + getNumReduceOperands(),
-                 getNumLocalOperands());
-    }
   }];
 }
 

flang/lib/Optimizer/OpenMP/DoConcurrentConversion.cpp

@@ -314,9 +314,9 @@ class DoConcurrentConversion
 
     // For `local` (and `local_init`) opernads, emit corresponding `private`
     // clauses and attach these clauses to the workshare loop.
-    if (!loop.getLocalOperands().empty())
+    if (!loop.getLocalVars().empty())
       for (auto [op, sym, arg] : llvm::zip_equal(
-               loop.getLocalOperands(),
+               loop.getLocalVars(),
                loop.getLocalSymsAttr().getAsRange<mlir::SymbolRefAttr>(),
                loop.getRegionLocalArgs())) {
         auto localizer = mlir::SymbolTable::lookupNearestSymbolFrom<