[mc] Clean up emission of byte sequences

No functional change intended.

llvm-svn: 235178
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
index 420c5c8..86885e1 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
@@ -178,12 +178,7 @@
     for (uint64_t i = 0; i != NumNops; ++i)
       OW->Write32(0x60000000);
 
-    switch (Count % 4) {
-    default: break; // No leftover bytes to write
-    case 1: OW->Write8(0); break;
-    case 2: OW->Write16(0); break;
-    case 3: OW->Write16(0); OW->Write8(0); break;
-    }
+    OW->WriteZeros(Count % 4);
 
     return true;
   }