CodeGen: Rename DEBUG_TYPE to match passnames

Rename the DEBUG_TYPE to match the names of corresponding passes where
it makes sense. Also establish the pattern of simply referencing
DEBUG_TYPE instead of repeating the passname where possible.

llvm-svn: 303921
diff --git a/llvm/lib/CodeGen/SlotIndexes.cpp b/llvm/lib/CodeGen/SlotIndexes.cpp
index bc2a1d0..3656832 100644
--- a/llvm/lib/CodeGen/SlotIndexes.cpp
+++ b/llvm/lib/CodeGen/SlotIndexes.cpp
@@ -19,7 +19,7 @@
 #define DEBUG_TYPE "slotindexes"
 
 char SlotIndexes::ID = 0;
-INITIALIZE_PASS(SlotIndexes, "slotindexes",
+INITIALIZE_PASS(SlotIndexes, DEBUG_TYPE,
                 "Slot index numbering", false, false)
 
 STATISTIC(NumLocalRenum,  "Number of local renumberings");