[rocfft] allow exporting llvm-cov format to lcov format (#1822)

We want to upload code coverage reports to codecov.io and the reports
must be in lcov format before doing so. This PR  adds a
command to the coverage target that that exports the profdata file to a
coverage.info file, which can then be uploaded to codecov.io by CI.

Author: reboss

clients/tests/CMakeLists.txt

@@ -458,6 +458,7 @@ if(BUILD_CODE_COVERAGE)
     COMMAND ${LLVM_PROFDATA} merge -sparse ./coverage-report/profraw/rocfft-coverage_*.profraw -o ./coverage-report/rocfft.profdata
     COMMAND ${LLVM_COV} report -object ./library/src/librocfft.so -instr-profile=./coverage-report/rocfft.profdata
     COMMAND ${LLVM_COV} show -object ./library/src/librocfft.so -instr-profile=./coverage-report/rocfft.profdata -format=html -output-dir=coverage-report
+    COMMAND ${LLVM_COV} export -object ./library/src/librocfft.so -instr-profile=./coverage-report/rocfft.profdata -format=lcov > ./coverage-report/coverage.info
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
   )