[Hexagon] Fix -Wimplicit-fallthrough warnings. NFCI.

llvm-svn: 307374
diff --git a/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp b/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
index aa68f6c..49ddd69 100644
--- a/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonConstPropagation.cpp
@@ -2244,6 +2244,7 @@
     case Hexagon::J2_jumpfnew:
     case Hexagon::J2_jumpfnewpt:
       Negated = true;
+      LLVM_FALLTHROUGH;
     case Hexagon::J2_jumpt:
     case Hexagon::J2_jumptnew:
     case Hexagon::J2_jumptnewpt: