[MLIR][NVVM] Remove irrelevant guards (#97345)

This code does not seem to involve the NVPTX backend anywhere.

Author: joker-eph

mlir/include/mlir/InitAllPasses.h

@@ -98,9 +98,7 @@ inline void registerAllPasses() {
   bufferization::registerBufferizationPipelines();
   sparse_tensor::registerSparseTensorPipelines();
   tosa::registerTosaToLinalgPipelines();
-#if LLVM_HAS_NVPTX_TARGET
   gpu::registerGPUToNVVMPipeline();
-#endif
 }
 
 } // namespace mlir

mlir/lib/Dialect/GPU/Pipelines/GPUToNVVMPipeline.cpp

@@ -38,7 +38,6 @@
 
 using namespace mlir;
 
-#if LLVM_HAS_NVPTX_TARGET
 namespace {
 
 //===----------------------------------------------------------------------===//
@@ -126,5 +125,3 @@ void mlir::gpu::registerGPUToNVVMPipeline() {
       "code.",
       buildLowerToNVVMPassPipeline);
 }
-
-#endif // LLVM_HAS_NVPTX_TARGET