[MLIR][GPU] Update serializeToObject to use SerializedObject wrapper and include ISA compiler logs (#176697) This PR makes the compilation log from ISA compiler available to users by returning it as part of the `gpu::ObjectAttr` properties, following the existing pattern like `LLVMIRToISATimeInMs`. Currently, the compiler log (which contains useful information such as spill statistics when --verbose is passed) is only accessible in debug builds via `LLVM_DEBUG`. However, there are good reasons to make this information available in release builds as well: 1. Both `ptxas` and `libnvptxcompiler` are publicly available tools/libraries distributed with the CUDA Toolkit. The `--verbose` flag and its output are documented public features, not internal debug information. 2. The verbose output provides valuable insights for users. A new `SerializedObject` class is used to carry the metadata alongside the binary when returning from `serializeObject`.
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