Add metadata pointer regex substitution to MIR update script

Signed-off-by: Domenic <domenic.nutile@gmail.com>

Author: saxlungs

llvm/utils/update_mir_test_checks.py

@@ -65,6 +65,8 @@
     flags=(re.M | re.S),
 )
 
+META_PTR_RE = re.compile(r"\<0x[a-f0-9]+\>", re.IGNORECASE)
+
 
 class LLC:
     def __init__(self, bin):
@@ -247,6 +249,14 @@ def update_test_file(args, test, autogenerated_note):
             common.warn("No triple found: skipping file", test_file=test)
             return
 
+        # Replace metadata pointer values inserted by LLC with generic regex
+        # capturing the pointer's format so that stale values don't break tests
+        no_pointer_output = ""
+        for line in raw_tool_output.splitlines():
+            line = META_PTR_RE.sub("<0x{{[0-9a-f]+}}>", line)
+            no_pointer_output += line + "\n"
+        raw_tool_output = no_pointer_output
+
         build_function_info_dictionary(
             test,
             raw_tool_output,