Replace "fallthrough" comments with LLVM_FALLTHROUGH

This is a mechanical change of comments in switches like fallthrough,
fall-through, or fall-thru to use the LLVM_FALLTHROUGH macro instead.

llvm-svn: 278902
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 87fb80c..e6d80ca 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -801,7 +801,7 @@
     default: llvm_unreachable("This action is not supported yet!");
     case TargetLowering::Custom:
       isCustom = true;
-      // FALLTHROUGH
+      LLVM_FALLTHROUGH;
     case TargetLowering::Legal: {
       Value = SDValue(Node, 0);
       Chain = SDValue(Node, 1);
@@ -1598,6 +1598,7 @@
           break;
         }
         // Fallthrough if we are unsigned integer.
+        LLVM_FALLTHROUGH;
     case ISD::SETLE:
     case ISD::SETGT:
     case ISD::SETGE: