get LLVM_MAIN_REVISION macro from compiler header

[illsilin]

Proposed changes

This fix will allow us to avoid compilation errors like:

[2025-12-10T05:58:58.525Z] /var/jenkins/workspace/LLIBS_composable_kernel_aick-468/include/ck_tile/core/algorithm/coordinate_transform.hpp:844:73: error: reference to host function '' in host device function
[2025-12-10T05:58:58.525Z] 844 | up_lengths_scan_{container_reverse_exclusive_scan(up_lengths, multiplies{}, number<1>{})}
[2025-12-10T05:58:58.525Z] | ^

with the latest mainline and staging compilers.

This will look up the value of the LLVM_MAIN_REVISION macro from the compiler's config.h header and either enable or disable the "host device" attributes.

Checklist

Please put an x into the boxes that apply. You can also fill these out after creating the PR. If you're not sure, please don't hesitate to ask.

• I have added tests relevant to the introduced functionality, and the unit tests are passing locally
• I have added the test to REGRESSION_TESTS list defined at the top of CMakeLists.txt in tests/CMakeLists.txt, IF the test takes more than 30 seconds to run.
• I have added inline documentation which enables the maintainers with understanding the motivation
• I have removed the stale documentation which is no longer relevant after this pull request
• (If this change is user-facing) I have added release notes which provide the end users with a brief summary of the improvement from this pull request
• I have run clang-format on all changed files
• Any dependent changes have been merged

[illsilin]

This workaround is not going to work for AITER or other libs that don't use cmake, but it should work for stand-alone CK builds for the time being, until we get the root-cause fixed in the math.hpp header.