Index: utils/extract_symbols.py
===================================================================
--- utils/extract_symbols.py
+++ utils/extract_symbols.py
@@ -170,6 +170,11 @@
     # <throw-spec> ::= exceptions are not allowed
     elif re.search('(llvm|clang)@@[A-Z][A-Z0-9_]*[A-JQ].+(X|.+@|.*Z)$', symbol):
         return symbol
+    # Keep mangled llvm::APFloatBase static fltSemantics data members:
+    elif re.fullmatch('\?[A-Za-z0-9_]+@APFloatBase@llvm@@2UfltSemantics@2@B',
+                      symbol):
+         return symbol;
+
     return None
 
 # Itanium manglings are of the form _Z<identifier_mangling><type_mangling>. We