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/OptimizePHIs.cpp b/llvm/lib/CodeGen/OptimizePHIs.cpp
index 2a8531f..76ad668 100644
--- a/llvm/lib/CodeGen/OptimizePHIs.cpp
+++ b/llvm/lib/CodeGen/OptimizePHIs.cpp
@@ -23,7 +23,7 @@
 #include "llvm/Target/TargetSubtargetInfo.h"
 using namespace llvm;
 
-#define DEBUG_TYPE "phi-opt"
+#define DEBUG_TYPE "opt-phis"
 
 STATISTIC(NumPHICycles, "Number of PHI cycles replaced");
 STATISTIC(NumDeadPHICycles, "Number of dead PHI cycles");
@@ -59,7 +59,7 @@
 
 char OptimizePHIs::ID = 0;
 char &llvm::OptimizePHIsID = OptimizePHIs::ID;
-INITIALIZE_PASS(OptimizePHIs, "opt-phis",
+INITIALIZE_PASS(OptimizePHIs, DEBUG_TYPE,
                 "Optimize machine instruction PHIs", false, false)
 
 bool OptimizePHIs::runOnMachineFunction(MachineFunction &Fn) {