test_jit.rb: change format of test error output

to avoid breaking redmine quote like
https://bugs.ruby-lang.org/issues/15522

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66781 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/lib/jit_support.rb

@@ -57,7 +57,7 @@ module JITSupport
   end
 
   def code_block(code)
-    "```\n#{code}\n```\n\n"
+    %Q["""\n#{code}\n"""\n\n]
   end
 
   # We're retrying cc1 not found error on gcc, which should be solved in the future but ignored for now.

test/ruby/test_jit.rb

@@ -597,7 +597,7 @@ class TestJIT < Test::Unit::TestCase
         end
       end;
 
-      debug_info = "stdout:\n```\n#{out}\n```\n\nstderr:\n```\n#{err}```\n"
+      debug_info = %Q[stdout:\n"""\n#{out}\n"""\n\nstderr:\n"""\n#{err}"""\n]
       assert_equal('012345678910', out, debug_info)
       compactions, errs = err.lines.partition do |l|
         l.match?(/\AJIT compaction \(\d+\.\dms\): Compacted \d+ methods ->/)