[DO NOT MERGE] ORC debug

[kingcrimsontianyu]

Description

This PR is not intended for merge. It is forked off @mhaseeb123 's branch bug/orc-rle.

The main purpose is to investigate an ORC decoding bug.

Build with device debug symbols

In nvcc, compiler options -E and -MD cannot be used together. However:

• Adding the device debug symbol (-G) for a selected set of .cu files appears to cause -MD to be added as a compiler option.
• sccache always forces -E to be appended even when export CCACHE_DISABLE=1 is used.

Given this conundrum, the hacky solution is to remove the use of sccache directly from the build.ninja file, before building libcudf with the device debug symbol added. The script rebuild_example.sh implements this workaround.

• To build libcudf with device debug symbols added to a selected set of .cu files + build the ORC example, run:

cd ~/cudf/cpp/examples/orc_io/debug
./rebuild_example.sh

• To load preset breakpoints and step in the kernel, run:

./debug.sh

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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