Add error recovery for abbreviations outside blocks in bitcode.

lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp

Index: lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp
diff --git a/lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp b/lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp
index 13b396955f8dc9e22c6e086815306aff736eb035..bb2261c80f786ae96f1bdd8550fe6205ee421c91 100644
--- a/lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp
+++ b/lib/Bitcode/NaCl/TestUtils/NaClBitcodeMungeWriter.cpp
@@ -404,6 +404,11 @@ bool WriteState::emitRecord(NaClBitstreamWriter &Writer,
       markCurrentBlockWithOmittedAbbreviations();
       return Flags.getTryToRecover();
     }
+    if (atOutermostScope()) {
+      RecoverableError() << "Abbreviation definition not in block: "
+                         << Record << "\n";
+      return Flags.getTryToRecover();
+    }
     if (getCurWriteBlockID() == naclbitc::BLOCKINFO_BLOCK_ID) {
       Writer.EmitBlockInfoAbbrev(SetBID, Abbrev);
     } else {