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/perfbd.py

@@ -485,6 +485,7 @@ def collect_dwarf_lines(obj_path, *,
 def collect_job(path, start, stop, syms, lines, *,
         sources=None,
         everything=False,
+        no_strip=False,
         propagate=0,
         depth=1,
         **args):
@@ -551,6 +552,10 @@ def collect_job(path, start, stop, syms, lines, *,
             else:
                 file = os.path.abspath(file)
 
+            # strip compiler suffixes
+            if not no_strip:
+                sym = sym.split('.', 1)[0]
+
             results[(file, sym, line)] = (
                     last_readed,
                     last_proged,
@@ -705,6 +710,10 @@ def collect_job(path, start, stop, syms, lines, *,
 
                         at_cache[addr] = file, sym, line
 
+                    # strip compiler suffixes
+                    if not no_strip:
+                        sym = sym.split('.', 1)[0]
+
                     last_stack.append((file, sym, line))
 
                     # stop propagating?
@@ -1763,6 +1772,10 @@ 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(
             '-A', '--annotate',
             action='store_true',