Updated util/test_llvm_versions.sh script

cmake/LLVMSetup.cmake

@@ -1,9 +1,5 @@
 message(STATUS "Checking for LLVM and Clang...")
 
-if(LLVM_VERSION STREQUAL "18")
-    set(LLVM_VERSION "18.1")
-endif()
-
 # If user provided a path to llvm-config executable use it to detect
 # LLVM Version and appropriate CMake module path
 if(NOT "${LLVM_CONFIG_PATH}" STREQUAL "")
@@ -26,6 +22,10 @@ if(NOT "${LLVM_CONFIG_PATH}" STREQUAL "")
     set(LLVM_VERSION ${CMAKE_MATCH_1})
 endif()
 
+if(LLVM_VERSION STREQUAL "18")
+    set(LLVM_VERSION "18.1")
+endif()
+
 find_package(LLVM ${LLVM_VERSION} CONFIG REQUIRED)
 
 list(APPEND CMAKE_MODULE_PATH ${LLVM_CMAKE_DIR})