[scripts] Fix demangle error

On my laptop, a few symbol names raise errors as invalid when attempting
to demangle them. This should not stop the rest of the symbol table from
building.

scripts/build_symbol_table.py

@@ -19,16 +19,19 @@ def parse_syms(infile):
     representing the symbols in the text segment of the binary. Returns
     a list of (address, symbol_name)."""
 
-    from cxxfilt import demangle
+    from cxxfilt import demangle, InvalidName
 
     syms = []
     for line in sys.stdin:
         addr, t, mangled = line.split()
         if t not in "tTvVwW": continue
 
-        addr = int(addr, base=16)
-        name = demangle(mangled)
-        syms.append((addr, name))
+        try:
+            addr = int(addr, base=16)
+            name = demangle(mangled)
+            syms.append((addr, name))
+        except InvalidName:
+            pass
 
     return sorted(syms)