Fork fission bufferize

• Refactor fork fission, add fork fission bufferized version.
• Add test that uses fork fission to create extra forks.

juno_samples/fork_join_tests/src/cpu.sch

@@ -12,6 +12,7 @@ cpu(out.test3);
 cpu(out.test4);
 cpu(out.test5);
 
+
 ip-sroa(*);
 sroa(*);
 dce(*);
@@ -42,14 +43,21 @@ gvn(*);
 phi-elim(*);
 dce(*);
 
+xdot[true](*);
+fork-fission-bufferize(test7@loop, test7@bufferize1, test7@bufferize2, test7@bufferize3, test7@bufferize4);
 fork-tile[32, 0, true](test6@loop);
 let out = fork-split(test6@loop);
 //let out = outline(out.test6.fj1);
+
+let out7 = auto-outline(test7);
+cpu(out7.test7);
+
 let out = auto-outline(test6);
 cpu(out.test6);
 ip-sroa(*);
 sroa(*);
 unforkify(out.test6);
+unforkify(out7.test7);
 dce(*);
 ccp(*);
 gvn(*);