Silence a bunch of implicit fallthrough warnings

llvm-svn: 321114
diff --git a/llvm/lib/Target/ARM/ARMFastISel.cpp b/llvm/lib/Target/ARM/ARMFastISel.cpp
index 0ea4350..60048d4 100644
--- a/llvm/lib/Target/ARM/ARMFastISel.cpp
+++ b/llvm/lib/Target/ARM/ARMFastISel.cpp
@@ -1416,7 +1416,7 @@
     case MVT::i8:
     case MVT::i16:
       needsExt = true;
-    // Intentional fall-through.
+      LLVM_FALLTHROUGH;
     case MVT::i32:
       if (isThumb2) {
         if (!UseImm)