Add testdata for a loop with cold entry and exit edges

PiperOrigin-RevId: 696893941

Author: dhoekwater

propeller/testdata/BUILD

@@ -38,6 +38,7 @@ exports_files([
     "hot_and_cold_landing_pads.protobuf",
     "llvm_function_samples.binary",
     "llvm_function_samples_perf.data",
+    "loop_no_entry_no_exit.protobuf",
     "propeller_sample.protobuf",
     "propeller_sample_1.bin",
     "sample.bin",

propeller/testdata/loop_no_entry_no_exit.protobuf

@@ -0,0 +1,71 @@
+## CFG Proto for a function consisting of a simple loop with cold entry and exit
+## edges.
+##
+##            foo
+##             |
+##             |0
+##             V
+##           a.BB.foo <--+
+##             |         |
+##             |         |45
+##             |40       |
+##             |         |
+##             v         |
+##          aa.BB.foo ---+
+##             |
+##             | 0
+##             v
+##         raa.BB.foo
+
+cfg {
+  name: "foo"
+  function_index: 0
+  node {
+    bb_id: 0
+    size: 10
+    out_edges {
+      sink: {
+        function_index: 0
+        bb_index: 1
+      }
+      weight: 0
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+  }
+  node {
+    bb_id: 1
+    size: 6
+    out_edges {
+      sink: {
+        function_index: 0
+        bb_index: 2
+      }
+      weight: 40
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+  }
+  node {
+    bb_id: 2
+    size: 4
+    out_edges {
+      sink: {
+        function_index: 0
+        bb_index: 3
+      }
+      weight: 0
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+    out_edges {
+      sink: {
+        function_index: 0
+        bb_index: 1
+      }
+      weight: 45
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+  }
+  node {
+    bb_id: 3
+    size: 3
+  }
+}