Include PSTATE in tombstones on arm64.

A thread's PSTATE can sometimes be critical for understanding a crash,
especially with MTE and other new features that store per-thread state
in PSTATE.

Bug: 135772972
Change-Id: I1bee25bffe7eea395f04b6449dc9227298cf866e
diff --git a/libunwindstack/tests/RegsIterateTest.cpp b/libunwindstack/tests/RegsIterateTest.cpp
index 9a27dbd..0247a2a 100644
--- a/libunwindstack/tests/RegsIterateTest.cpp
+++ b/libunwindstack/tests/RegsIterateTest.cpp
@@ -114,6 +114,7 @@
   result.push_back({"sp", ARM64_REG_SP});
   result.push_back({"lr", ARM64_REG_LR});
   result.push_back({"pc", ARM64_REG_PC});
+  result.push_back({"pst", ARM64_REG_PSTATE});
   return result;
 }