Use a bit of relaxed constexpr to make FeatureBitset costant intializable

This requires std::intializer_list to be a literal type, which it is
starting with C++14. The downside is that std::bitset is still not
constexpr-friendly so this change contains a re-implementation of most
of it.

Shrinks clang by ~60k.

llvm-svn: 369847

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/utils/TableGen/SearchableTableEmitter.cpp b/llvm/utils/TableGen/SearchableTableEmitter.cpp
index e274415f3ed..f08f8aa0195 100644
--- a/llvm/utils/TableGen/SearchableTableEmitter.cpp
+++ b/llvm/utils/TableGen/SearchableTableEmitter.cpp
@@ -496,7 +496,7 @@ void SearchableTableEmitter::emitGenericTable(const GenericTable &Table,
   emitIfdef((Twine("GET_") + Table.PreprocessorGuard + "_IMPL").str(), OS);
 
   // The primary data table contains all the fields defined for this map.
-  OS << "const " << Table.CppTypeName << " " << Table.Name << "[] = {\n";
+  OS << "constexpr " << Table.CppTypeName << " " << Table.Name << "[] = {\n";
   for (unsigned i = 0; i < Table.Entries.size(); ++i) {
     Record *Entry = Table.Entries[i];
     OS << "  { ";