[llvm] [BOLT] Adding a unittest that covers Arm SPE PBT aggregation (PR #160095)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- bolt/unittests/Profile/PerfSpeEvents.cpp
``````````

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``````````diff
diff --git a/bolt/unittests/Profile/PerfSpeEvents.cpp b/bolt/unittests/Profile/PerfSpeEvents.cpp
index 0ec4651a5..0c1ddbd67 100644
--- a/bolt/unittests/Profile/PerfSpeEvents.cpp
+++ b/bolt/unittests/Profile/PerfSpeEvents.cpp
@@ -174,14 +174,15 @@ TEST_F(PerfSpeEventsTestHelper, SpeBranchesWithBrstackAndPbt) {
   // ```
 
   opts::ArmSPE = true;
-  opts::ReadPerfEvents = "  4567  0xa002/0xa003/PN/-/-/10/COND/- 0x0/0xa001/-/-/-/0//-\n"
-                         "  4567  0xb002/0xb003/P/-/-/4/RET/- 0x0/0xb001/-/-/-/0//-\n"
-                         "  4567  0xc456/0xc789/P/-/-/13/-/- 0x0/0xc123/-/-/-/0//-\n"
-                         "  4567  0xd456/0xd789/M/-/-/7/RET/- 0x0/0xd123/-/-/-/0//-\n"
-                         "  4567  0xe005/0xe009/P/-/-/14/RET/- 0x0/0xe001/-/-/-/0//-\n"
-                         "  4567  0xd456/0xd789/M/-/-/7/RET/- 0x0/0xd123/-/-/-/0//-\n"
-                         "  4567  0xf002/0xf003/MN/-/-/8/COND/- 0x0/0xf001/-/-/-/0//-\n"
-                         "  4567  0xc456/0xc789/P/-/-/13/-/- 0x0/0xc123/-/-/-/0//-\n";
+  opts::ReadPerfEvents =
+      "  4567  0xa002/0xa003/PN/-/-/10/COND/- 0x0/0xa001/-/-/-/0//-\n"
+      "  4567  0xb002/0xb003/P/-/-/4/RET/- 0x0/0xb001/-/-/-/0//-\n"
+      "  4567  0xc456/0xc789/P/-/-/13/-/- 0x0/0xc123/-/-/-/0//-\n"
+      "  4567  0xd456/0xd789/M/-/-/7/RET/- 0x0/0xd123/-/-/-/0//-\n"
+      "  4567  0xe005/0xe009/P/-/-/14/RET/- 0x0/0xe001/-/-/-/0//-\n"
+      "  4567  0xd456/0xd789/M/-/-/7/RET/- 0x0/0xd123/-/-/-/0//-\n"
+      "  4567  0xf002/0xf003/MN/-/-/8/COND/- 0x0/0xf001/-/-/-/0//-\n"
+      "  4567  0xc456/0xc789/P/-/-/13/-/- 0x0/0xc123/-/-/-/0//-\n";
 
   // ExpectedSamples contains the aggregated information about
   // a branch {{From, To, TraceTo}, {TakenCount, MispredCount}}.
@@ -198,12 +199,18 @@ TEST_F(PerfSpeEventsTestHelper, SpeBranchesWithBrstackAndPbt) {
   // the 'From' field filled with zero (0x0).
   // TraceTo = 0xc456, means the execution jumped from 0xc123 to 0xc456.
   std::vector<std::pair<Trace, TakenBranchInfo>> ExpectedSamples = {
-      {{0xa002, 0xa003, Trace::BR_ONLY}, {1, 0}}, {{0x0, 0xa001, 0xa002}, {1, 0}},
-      {{0xb002, 0xb003, Trace::BR_ONLY}, {1, 0}}, {{0x0, 0xb001, 0xb002}, {1, 0}},
-      {{0xc456, 0xc789, Trace::BR_ONLY}, {2, 0}}, {{0x0, 0xc123, 0xc456}, {2, 0}},
-      {{0xd456, 0xd789, Trace::BR_ONLY}, {2, 2}}, {{0x0, 0xd123, 0xd456}, {2, 0}},
-      {{0xe005, 0xe009, Trace::BR_ONLY}, {1, 0}}, {{0x0, 0xe001, 0xe005}, {1, 0}},
-      {{0xf002, 0xf003, Trace::BR_ONLY}, {1, 1}}, {{0x0, 0xf001, 0xf002}, {1, 0}}};
+      {{0xa002, 0xa003, Trace::BR_ONLY}, {1, 0}},
+      {{0x0, 0xa001, 0xa002}, {1, 0}},
+      {{0xb002, 0xb003, Trace::BR_ONLY}, {1, 0}},
+      {{0x0, 0xb001, 0xb002}, {1, 0}},
+      {{0xc456, 0xc789, Trace::BR_ONLY}, {2, 0}},
+      {{0x0, 0xc123, 0xc456}, {2, 0}},
+      {{0xd456, 0xd789, Trace::BR_ONLY}, {2, 2}},
+      {{0x0, 0xd123, 0xd456}, {2, 0}},
+      {{0xe005, 0xe009, Trace::BR_ONLY}, {1, 0}},
+      {{0x0, 0xe001, 0xe005}, {1, 0}},
+      {{0xf002, 0xf003, Trace::BR_ONLY}, {1, 1}},
+      {{0x0, 0xf001, 0xf002}, {1, 0}}};
 
   parseAndCheckBrstackEvents(4567, ExpectedSamples);
 }

``````````

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https://github.com/llvm/llvm-project/pull/160095