Generalize finding the rocm_agent_enumberator program

[trixirt]

Summary

On Fedora, rocminfo is a fedora package and rocm_agent_enumberator is
installed to /usr/bin. This causes this error when building.

CMake Error at external/llvm-project/mlir/lib/ExecutionEngine/CMakeLists.txt:232 (message):

Could not run rocm_agent_enumerator and ROCM_TEST_CHIPSET is not defined

So use find_program() to look for rocm_agent_enumerator instead of assuming a
single location.

Signed-off-by: Tom Rix <[e-mail]>

[krzysz00]

Do you need me to land this?

[trixirt]

yes, i will need help landing this, i do not have commit permissions.

mlir/lib/ExecutionEngine/CMakeLists.txt

if(MLIR_ENABLE_ROCM_RUNNER)
     # Therefore, temporarily add the ROCm path to CMAKE_PREFIX_PATH so we can
     # load HIP, then remove it
     set(REAL_CMAKE_PREFIX_PATH "${CMAKE_PREFIX_PATH}")
     list(APPEND CMAKE_PREFIX_PATH ${ROCM_PATH} "${ROCM_PATH}/hip")
     find_package(hip REQUIRED)
     set(CMAKE_PREFIX_PATH "${REAL_CMAKE_PREFIX_PATH}")
 
     if (NOT DEFINED ROCM_TEST_CHIPSET)
-      execute_process(COMMAND "${ROCM_PATH}/bin/rocm_agent_enumerator"
+      find_program(ROCM_AGENT_ENUMERATOR rocm_agent_enumerator "${ROCM_PATH}/bin" /usr/bin /usr/local/bin)
+      if(ROCM_AGENT_ENUMERATOR)
+          execute_process(COMMAND "${ROCM_AGENT_ENUMERATOR}"
           OUTPUT_VARIABLE AGENTS_STRING
           ERROR_VARIABLE AGENTS_STRING
           RESULT_VARIABLE AGENT_ENUMERATOR_RESULT)
-
+      else()
+        message(SEND_ERROR "Could not find rocm_agent_enumerator")
+      endif()
       if (NOT AGENT_ENUMERATOR_RESULT EQUAL 0)
         message(SEND_ERROR "Could not run rocm_agent_enumerator and ROCM_TEST_CHIPSET is not defined")
         set(AGENTS_STRING "")
       endif()
       string(STRIP AGENTS_STRING ${AGENTS_STRING})
       string(REPLACE "\n" ";" AGENTS_LIST ${AGENTS_STRING})
       list(FILTER AGENTS_LIST EXCLUDE REGEX "gfx000")
       if (AGENTS_LIST STREQUAL "")