[ThinLTO] Fix lazy-loading of Metadata attachment, which left some Fwd ref behind

The change in r291362 was too agressive. We still need to flush at the
end of the block because function local metadata can introduce fwd
ref as well.
(Bootstrap with ThinLTO was broken)

llvm-svn: 291379

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
index 89edbbef92e..4a5d18e2db7 100644
--- a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
+++ b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
@@ -1561,6 +1561,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseMetadataAttachment(
     return error("Invalid record");
 
   SmallVector<uint64_t, 64> Record;
+  PlaceholderQueue Placeholders;
 
   while (true) {
     BitstreamEntry Entry = Stream.advanceSkippingSubblocks();
@@ -1570,6 +1571,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseMetadataAttachment(
     case BitstreamEntry::Error:
       return error("Malformed block");
     case BitstreamEntry::EndBlock:
+      resolveForwardRefsAndPlaceholders(Placeholders);
       return Error::success();
     case BitstreamEntry::Record:
       // The interesting case.
@@ -1608,7 +1610,6 @@ Error MetadataLoader::MetadataLoaderImpl::parseMetadataAttachment(
             !MetadataList.lookup(Idx)) {
           // Load the attachment if it is in the lazy-loadable range and hasn't
           // been loaded yet.
-          PlaceholderQueue Placeholders;
           lazyLoadOneMetadata(Idx, Placeholders);
           resolveForwardRefsAndPlaceholders(Placeholders);
         }