Revert "Revert "ART: Update DCE to work with try/catch""

The previous CL failed because it did not update inputs of catch phis.
Since phi input indices cannot be easily mapped back to throwing
instructions, this new implementation at least removes catch phi uses
of values defined in the removed blocks to preserve graph consistency.

This reverts commit fb552d7061746f7a90fdd5002696e255e2e15c35.

Change-Id: I63d95915d1ef50e71d3bcf0cd10aaded554035b4
diff --git a/test/543-checker-dce-trycatch/info.txt b/test/543-checker-dce-trycatch/info.txt
new file mode 100644
index 0000000..e541938
--- /dev/null
+++ b/test/543-checker-dce-trycatch/info.txt
@@ -0,0 +1 @@
+Tests removal of try/catch blocks by DCE.
\ No newline at end of file