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/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index faf45cb..8569c4d 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -537,7 +537,7 @@
     --NumParams;
     if (!IsSizeTTy(FTy.getParamType(NumParams)))
       return false;
-  // fallthrough
+    LLVM_FALLTHROUGH;
   case LibFunc::strcpy:
   case LibFunc::stpcpy:
     return (NumParams == 2 && FTy.getReturnType() == FTy.getParamType(0) &&
@@ -549,7 +549,7 @@
     --NumParams;
     if (!IsSizeTTy(FTy.getParamType(NumParams)))
       return false;
-  // fallthrough
+    LLVM_FALLTHROUGH;
   case LibFunc::strncpy:
   case LibFunc::stpncpy:
     return (NumParams == 3 && FTy.getReturnType() == FTy.getParamType(0) &&
@@ -642,7 +642,7 @@
     --NumParams;
     if (!IsSizeTTy(FTy.getParamType(NumParams)))
       return false;
-  // fallthrough
+    LLVM_FALLTHROUGH;
   case LibFunc::memcpy:
   case LibFunc::mempcpy:
   case LibFunc::memmove:
@@ -655,7 +655,7 @@
     --NumParams;
     if (!IsSizeTTy(FTy.getParamType(NumParams)))
       return false;
-  // fallthrough
+    LLVM_FALLTHROUGH;
   case LibFunc::memset:
     return (NumParams == 3 && FTy.getReturnType() == FTy.getParamType(0) &&
             FTy.getParamType(0)->isPointerTy() &&