scripts: Strip compiler suffixes in result scripts

This can be explicitly disabled with -x/--no-strip in the relevant
scripts, but stripping by default seems to be more useful for composing
results in higher-level scripts. It's better for the result names to be
consistent, even if they don't match the .o symbols exactly.

Note some scripts are unaffected:

- cov.py - gcov doesn't seem to have an option for getting the
  unstripped symbols, so we only output the stripped names.

- structs.py - structs.py deals with struct names, which are notably not
  symbols.

scripts/perf.py

@@ -576,6 +576,7 @@ def collect_decompressed(path, *,
         perf_path=PERF_PATH,
         sources=None,
         everything=False,
+        no_strip=False,
         propagate=0,
         depth=1,
         **args):
@@ -742,6 +743,10 @@ def collect_decompressed(path, *,
                 else:
                     file, line = re.sub('(\.o)?$', '.c', dso, 1), 0
 
+                # strip compiler suffixes
+                if not no_strip:
+                    sym = sym.split('.', 1)[0]
+
                 last_stack.append((file, sym, line))
 
                 # stop propogating?
@@ -1766,6 +1771,10 @@ if __name__ == "__main__":
             '--everything',
             action='store_true',
             help="Include builtin and libc specific symbols.")
+    parser.add_argument(
+            '-x', '--no-strip',
+            action='store_true',
+            help="Don't strip compiler optimization suffixes from symbols.")
     parser.add_argument(
             '--branches',
             action='store_true',