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

[clementval]

Summary

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.

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

def FIRToLLVMLowering : Pass<"fir-to-llvm-ir", "mlir::ModuleOp"> {
   let constructor = "::fir::createFIRToLLVMPass()";
   let dependentDialects = ["mlir::LLVM::LLVMDialect"];
   let options = [
     Option<"forcedTargetTriple", "target", "std::string", /*default=*/"",
            "Override module's target triple.">
   ];
 }
 
-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">
   ];
 }
 
 def TargetRewrite : Pass<"target-rewrite", "mlir::ModuleOp"> {
   let summary = "Rewrite some FIR dialect into target specific forms.";