[fir][NFC] Rename lenParams to typeparams in builders

[clementval]

Summary

Fine tuning after couple of upstreamed patches.
Rename the lenParams varaiables in buidlers to typeparams.

This patch is part of the upstreaming effort from fir-dev branch.

[kiranchandramohan]

LGTM.

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

def fir_EmboxOp : fir_Op<"embox", [NoSideEffect, AttrSizedOperandSegments]> {
   );
 
   let results = (outs fir_BoxType);
 
   let builders = [
     OpBuilder<(ins "llvm::ArrayRef<mlir::Type>":$resultTypes,
       "mlir::Value":$memref, CArg<"mlir::Value", "{}">:$shape,
       CArg<"mlir::Value", "{}">:$slice,
-      CArg<"mlir::ValueRange", "{}">:$lenParams),
+      CArg<"mlir::ValueRange", "{}">:$typeparams),
     [{ return build($_builder, $_state, resultTypes, memref, shape, slice,
-                    lenParams, mlir::AffineMapAttr{}); }]>
+                    typeparams, mlir::AffineMapAttr{}); }]>
   ];
 
   let assemblyFormat = [{
     $memref (`(` $shape^ `)`)? (`[` $slice^ `]`)? (`typeparams` $typeparams^)?
       (`map` $accessMap^)? attr-dict `:` functional-type(operands, results)
   }];
 
-  let verifier = [{ return ::verify(*this); }];
+  let verifier = "return ::verify(*this);";
 
   let extraClassDeclaration = [{
     mlir::Value getShape() { return shape(); }
     mlir::Value getSlice() { return slice(); }
     bool hasLenParams() { return !typeparams().empty(); }
     unsigned numLenParams() { return typeparams().size(); }
   }];
 }