From f5ce7ef4a8f40027c7eba4606d7ee4a9abeb844c Mon Sep 17 00:00:00 2001
From: Bill Wendling
Live Intervals are the ranges (intervals) where a variable is live. They are used by some register allocator passes to determine if two or more virtual registers which require the same physical -register are live at the same point in the program (i.e., theyconflict). When +register are live at the same point in the program (i.e., they conflict). When this situation occurs, one virtual register must be spilled.