[GR-62802] Stop using -UseJVMCICompiler in jt test compiler clone-uninitialized-checks

* That option does not work for unchained standalones (or needs DisableVersionChecks).
* The time difference is not that big.

Author: eregon

test/truffle/compiler/clone-uninitialized-checks.sh

@@ -5,4 +5,4 @@ source test/truffle/common.sh.inc
 export TRUFFLERUBY_CHECK_PREINITIALIZED_SPEC=false
 
 # --always-clone-all covers more than just --core-always-clone, but is much slower (6 min vs 1 min)
-JT_SPECS_COMPILATION=false JT_SPECS_SPLITTING=true jt test fast -- --experimental-options --core-always-clone --check-clone-uninitialized-correctness
+jt test fast -- --experimental-options --engine.Compilation=false --core-always-clone --check-clone-uninitialized-correctness

tool/jt.rb

@@ -1787,7 +1787,9 @@ def mspec(*args)
     vm_args, ruby_args, parsed_options = ruby_options({}, ['--ea', *ruby_args])
 
     if !JT_SPECS_COMPILATION && truffleruby_compiler? && truffleruby_jvm?
-      vm_args << '--vm.XX:-UseJVMCICompiler' << '--experimental-options' << '--engine.Compilation=false'
+      # Note: GR-62802: --vm.XX:-UseJVMCICompiler does not work for unchained standalones or needs --vm.Dpolyglotimpl.DisableVersionChecks=true
+      vm_args << '--vm.XX:-UseJVMCICompiler'
+      vm_args << '--experimental-options' << '--engine.Compilation=false'
       vm_args << '--engine.Splitting=false' unless JT_SPECS_SPLITTING
     end