[flang][NFC] Cleanup dependent dialects and make def homogenous

Remove unnecessary dependent dialect and make the definition of the
pass more homogenous with the two others.

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

Reviewed By: jeanPerier

Differential Revision: https://reviews.llvm.org/D117688

flang/include/flang/Optimizer/CodeGen/CGPasses.td

@@ -30,15 +30,14 @@ def FIRToLLVMLowering : Pass<"fir-to-llvm-ir", "mlir::ModuleOp"> {
   ];
 }
 
-def CodeGenRewrite : Pass<"cg-rewrite"> {
+def CodeGenRewrite : Pass<"cg-rewrite", "mlir::ModuleOp"> {
   let summary = "Rewrite some FIR ops into their code-gen forms.";
   let description = [{
     Fuse specific subgraphs into single Ops for code generation.
   }];
-  let constructor = "fir::createFirCodeGenRewritePass()";
+  let constructor = "::fir::createFirCodeGenRewritePass()";
   let dependentDialects = [
-    "fir::FIROpsDialect", "fir::FIRCodeGenDialect", "mlir::BuiltinDialect",
-    "mlir::LLVM::LLVMDialect", "mlir::omp::OpenMPDialect"
+    "fir::FIROpsDialect", "fir::FIRCodeGenDialect"
   ];
   let statistics = [
     Statistic<"numDCE", "num-dce'd", "Number of operations eliminated">