[PowerPC] Fix PR22711 - Misaligned .toc section

Straightforward patch to emit an alignment directive when emitting a
TOC entry.  The test case was generated from the test in PR22711 that
demonstrated a misaligned .toc section.  The object code is run
through llvm-readobj to verify that the correct alignment has been
applied to the .toc section.

Thanks to Ulrich Weigand for running down where the fix was needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230801 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp

@@ -145,6 +145,7 @@ public:
   }
   void emitTCEntry(const MCSymbol &S) override {
     // Creates a R_PPC64_TOC relocation
+    Streamer.EmitValueToAlignment(8);
     Streamer.EmitSymbolValue(&S, 8);
   }
   void emitMachine(StringRef CPU) override {