[lldb] Support Rosetta registers in crashlog.py

Rosetta crashlogs can have their own thread register state. Unlike the
other registers which ware directly listed under "threadState", the
Rosetta registers are nested under their own key in the JSON, as
illustrated below:

  {
      "threadState":
      {
          "rosetta":
          {
              "tmp2":
              {
                  "value": 4935057216
              },
              "tmp1":
              {
                  "value": 4365863188
              },
              "tmp0":
              {
                  "value": 18446744073709551615
              }
          }
      }
  }

lldb/examples/python/crashlog.py

@@ -523,10 +523,13 @@ class JSONCrashLogParser:
     def parse_thread_registers(self, json_thread_state):
         registers = dict()
         for key, state in json_thread_state.items():
+            if key == "rosetta":
+               registers.update(self.parse_thread_registers(state))
+               continue
             try:
                value = int(state['value'])
                registers[key] = value
-            except (TypeError, ValueError):
+            except (KeyError, ValueError, TypeError):
                pass
         return registers
 

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/Inputs/a.out.ips

@@ -106,6 +106,17 @@
       "rcx": {
         "value": 140732860114656
       },
+      "rosetta": {
+        "tmp2": {
+          "value": 8
+        },
+        "tmp1": {
+          "value": 20
+        },
+        "tmp0": {
+          "value": 92
+        }
+      },
       "flavor": "x86_THREAD_STATE",
       "rdi": {
         "value": 1

lldb/test/Shell/ScriptInterpreter/Python/Crashlog/json.test

@@ -13,5 +13,6 @@
 # CHECK: [  1] {{.*}}out`bar + 8 at test.c
 # CHECK: [  2] {{.*}}out`main + 19 at test.c
 # CHECK: rbp = 0x00007ffeec22a530
+# CHECK: tmp2 = 0x0000000000000008
 # CHECK: invalid foo
 # CHECK: invalid bar