[llvm] [UTC] Indent switch cases (PR #165212)

[Kunqiu Chen via llvm-commits]

================
@@ -260,9 +260,14 @@ def update_test(ti: common.TestInfo):
                 skip_same_checks=dropped_previous_line,
             ):
                 # This input line of the function body will go as-is into the output.
-                # Except make leading whitespace uniform: 2 spaces. 4 for debug records.
+                # Except make leading whitespace uniform: 2 spaces. 4 for debug records/switch cases.
                 indent = (
-                    "  " if not common.IS_DEBUG_RECORD_RE.match(input_line) else "    "
+                    " " * 4
+                    if (
+                        common.IS_DEBUG_RECORD_RE.match(input_line)
+                        or common.IS_SWITCH_CASE_RE.match(input_line)
----------------
Camsyn wrote:

> I'd also consider gating this under a new UTC version. I think this will produce just enough test churn to be annoying.
Do you mean some change like this?
```suggestion

                        or (
                            ti.args.version > 4
                            and common.IS_SWITCH_CASE_RE.match(input_line)
                        )
```

https://github.com/llvm/llvm-project/pull/165212