[MLIR] Avoid #include OMPIRBuilder.h (#151302)

`#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"` can be replaced with
forward-declarations of `OpenMPIRBuilder` and `CanonicalLoopInfo`. This
also avoids a dependency to `omp_gen` of the LLVMFrontendOpenMP
component which is included indirectly in `OMPIRBuilder.h`.

Since its inclusion in #147069, additional indirect dependencies on
headers included by `OMPIRBuilder.h` were introduced as well. These are
now included directly.

Reported-by: fabrizio-indirli

See
#147069 (comment)

Author: Meinersbur

mlir/include/mlir/Target/LLVMIR/ModuleTranslation.h

@@ -25,11 +25,12 @@
 #include "mlir/Target/LLVMIR/TypeToLLVM.h"
 
 #include "llvm/ADT/SetVector.h"
-#include "llvm/Frontend/OpenMP/OMPIRBuilder.h"
 #include "llvm/IR/FPEnv.h"
+#include "llvm/IR/Module.h"
 
 namespace llvm {
 class BasicBlock;
+class CanonicalLoopInfo;
 class Function;
 class IRBuilderBase;
 class OpenMPIRBuilder;

mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp

@@ -30,6 +30,7 @@
 #include "mlir/IR/Types.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/TypeSwitch.h"
+#include "llvm/IR/IRBuilder.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/raw_ostream.h"

mlir/lib/Target/LLVMIR/Dialect/NVVM/LLVMIRToNVVMTranslation.cpp

@@ -13,6 +13,7 @@
 #include "mlir/Target/LLVMIR/Dialect/NVVM/LLVMIRToNVVMTranslation.h"
 #include "mlir/Dialect/LLVMIR/NVVMDialect.h"
 #include "mlir/Target/LLVMIR/ModuleImport.h"
+#include "llvm/IR/ConstantRange.h"
 
 using namespace mlir;
 using namespace mlir::NVVM;