Add experimental builder infrastructure for composable_kernel
- Add experimental/builder directory with README documentation.
- Create initial test infrastructure with CMakeLists.txt and placeholder test.
- Update root CMakeLists.txt to support CK_EXPERIMENTAL_BUILDER option.
- Update .gitignore to not treat `experimental/builder` as a CMake build directory.
This establishes the directory structure for a high-level builder pattern that will provide a semantically-clear interface for constructing CK operations, with initial focus on convolution kernels for MIOpen integration.
[ROCm/composable_kernel commit: f18b79f328]
Our current cmake/gtest.cmake file does not enable gmock. Gmock is needed for matchers that are needed for more readable unit tests. This PR enables gmock and does a little cleanup in gtest.cmake:
* Enable BUILD_GMOCK by default (was previously disabled)
* Patch gtest-src/googlemock/CMakeLists.txt for broken include path.
* Add configuration to gmock if the target is used.
No other changes in this PR, but I've verified I can use gmock matchers correctly once I include these changes in other code.
[ROCm/composable_kernel commit: fc2a121c44]
