Revert "[flang][cuda] Run target rewrite in gpu.module" (#118679)

Reverts #118592

Author: clementval

flang/lib/Optimizer/CodeGen/TargetRewrite.cpp

@@ -27,7 +27,6 @@
 #include "flang/Optimizer/Dialect/Support/FIRContext.h"
 #include "flang/Optimizer/Support/DataLayout.h"
 #include "mlir/Dialect/DLTI/DLTI.h"
-#include "mlir/Dialect/GPU/IR/GPUDialect.h"
 #include "mlir/Dialect/LLVMIR/LLVMDialect.h"
 #include "mlir/Transforms/DialectConversion.h"
 #include "llvm/ADT/STLExtras.h"
@@ -721,11 +720,6 @@ class TargetRewrite : public fir::impl::TargetRewritePassBase<TargetRewrite> {
 
       convertSignature(fn);
     }
-
-    for (auto gpuMod : mod.getOps<mlir::gpu::GPUModuleOp>())
-      for (auto fn : gpuMod.getOps<mlir::func::FuncOp>())
-        convertSignature(fn);
-
     return mlir::success();
   }