Revert "[mlir] Lower math dialect later in gpu-lower-to-nvvm-pipeline (#78556)"

This reverts commit 74bf0b1. The test
always fails.

 | mlir/test/Dialect/GPU/test-nvvm-pipeline.mlir:23:16: error: CHECK-PTX: expected string not found in input
 |  // CHECK-PTX: __nv_expf

https://lab.llvm.org/buildbot/#/builders/61/builds/53789

Author: d0k

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

@@ -51,6 +51,7 @@ void buildCommonPassPipeline(
   pm.addPass(createConvertVectorToSCFPass());
   pm.addPass(createConvertSCFToCFPass());
   pm.addPass(createConvertNVVMToLLVMPass());
+  pm.addPass(createConvertMathToLLVMPass());
   pm.addPass(createConvertFuncToLLVMPass());
   pm.addPass(memref::createExpandStridedMetadataPass());
 
@@ -97,7 +98,6 @@ void buildHostPostPipeline(OpPassManager &pm,
   GpuModuleToBinaryPassOptions gpuModuleToBinaryPassOptions;
   gpuModuleToBinaryPassOptions.compilationTarget = options.cubinFormat;
   pm.addPass(createGpuModuleToBinaryPass(gpuModuleToBinaryPassOptions));
-  pm.addPass(createConvertMathToLLVMPass());
   pm.addPass(createCanonicalizerPass());
   pm.addPass(createCSEPass());
   pm.addPass(createReconcileUnrealizedCastsPass());