[CodeGen] Rename DEBUG_TYPE to match passnames

Rename missing DEBUG_TYPE "machine-scheduler" from backend files, which were
absent from https://reviews.llvm.org/rL303921.

Differential revision: https://reviews.llvm.org/D35231

llvm-svn: 307719
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
index 0f70b0e..ccd9379 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -63,7 +63,7 @@
 
 using namespace llvm;
 
-#define DEBUG_TYPE "misched"
+#define DEBUG_TYPE "machine-scheduler"
 
 static cl::opt<bool> EnableAASchedMI("enable-aa-sched-mi", cl::Hidden,
     cl::ZeroOrMore, cl::init(false),