test/lib/jit_support.rb: continue to skip test_jit

for icc since it's not supported yet but running on rubyci.

This reverts some part of r65175, r65176 and r65177.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65178 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/lib/jit_support.rb

@@ -1,9 +1,8 @@
 module JITSupport
   JIT_TIMEOUT = 600 # 10min for each...
   JIT_SUCCESS_PREFIX = 'JIT success \(\d+\.\dms\)'
-  SUPPORTED_COMPILERS = [
-    'gcc',
-    'clang',
+  UNSUPPORTED_COMPILERS = [
+    'icc',
   ]
 
   module_function
@@ -35,6 +34,11 @@ module JITSupport
     )
   end
 
+  def supported?
+    return @supported if defined?(@supported)
+    @supported = !UNSUPPORTED_COMPILERS.include?(RbConfig::CONFIG['CC'])
+  end
+
   def remove_mjit_logs(stderr)
     if RubyVM::MJIT.enabled?
       stderr.gsub(/^MJIT warning: Skipped to compile unsupported instruction: \w+\n/m, '')