6d537d7e61
Since we don't have precise liveness information inside try-catch blocks, there are often redundant phis inside try-catch of the form v <- phi(v, v, ..., R, v, v, ...) This CL finds these redundant phis and replaces them with R. BUG= R=rmacnak@google.com Review URL: https://codereview.chromium.org/1918913002 .