Fix really stupid ARM EHABI info generation bug: we should not emit
eh table and handler data if there are no landing pads in the function.
Patch by Logan Chien with some cleanups from me.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167945 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/ARMException.cpp b/lib/CodeGen/AsmPrinter/ARMException.cpp
index b2ebf04..8eea802 100644
--- a/lib/CodeGen/AsmPrinter/ARMException.cpp
+++ b/lib/CodeGen/AsmPrinter/ARMException.cpp
@@ -69,22 +69,25 @@
     Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
                                                   Asm->getFunctionNumber()));
 
-    // Emit references to personality.
-    if (const Function * Personality =
-        MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
-      MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
-      Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
-      Asm->OutStreamer.EmitPersonality(PerSym);
-    }
-
     if (EnableARMEHABIDescriptors) {
       // Map all labels and get rid of any dead landing pads.
       MMI->TidyLandingPads();
 
-      Asm->OutStreamer.EmitHandlerData();
+      if (!MMI->getLandingPads().empty()) {
+        // Emit references to personality.
+        if (const Function * Personality =
+            MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
+          MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
+          Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
+          Asm->OutStreamer.EmitPersonality(PerSym);
+        }
 
-      // Emit actual exception table
-      EmitExceptionTable();
+        // Emit .handlerdata directive.
+        Asm->OutStreamer.EmitHandlerData();
+
+        // Emit actual exception table
+        EmitExceptionTable();
+      }
     }
   }