Silence compiler warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117128 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 3220789..85d28f9 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -1264,8 +1264,12 @@
   switch (CC) {
   default:
     llvm_unreachable("Unsupported calling convention");
-  case CallingConv::C:
   case CallingConv::Fast:
+    // Ignore fastcc. Silence compiler warnings.
+    (void)RetFastCC_ARM_APCS;
+    (void)FastCC_ARM_APCS;
+    // Fallthrough
+  case CallingConv::C:
     // Use target triple & subtarget features to do actual dispatch.
     if (Subtarget->isAAPCS_ABI()) {
       if (Subtarget->hasVFP2() &&