Add initial support for the convergent attribute.

llvm-svn: 238264

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -1095,6 +1095,8 @@ static Attribute::AttrKind GetAttrFromCode(uint64_t Code) {
     return Attribute::InAlloca;
   case bitc::ATTR_KIND_COLD:
     return Attribute::Cold;
+  case bitc::ATTR_KIND_CONVERGENT:
+    return Attribute::Convergent;
   case bitc::ATTR_KIND_INLINE_HINT:
     return Attribute::InlineHint;
   case bitc::ATTR_KIND_IN_REG: