Add a testdata proto for a function call within a loop

propeller/testdata/BUILD

@@ -33,6 +33,7 @@ exports_files([
     "all_cold_landing_pads.protobuf",
     "bimodal_sample.bin",
     "bimodal_sample.x.bin",
+    "call_from_simple_loop.protobuf",
     "clang_v0_labels.binary",
     "llvm_function_samples.binary",
     "llvm_function_samples_perf.data",

propeller/testdata/call_from_simple_loop.protobuf

@@ -0,0 +1,87 @@
+## CFG consisting of a function calling another function in a simple loop.
+##
+##         foo <------- baz
+##          |     100
+##        5 |
+##          |
+##          v      100
+##   +---> foo.1 -------> bar
+##   |       |
+##   | 100   |100
+##   |       |
+##   |       v   
+##   +--- foo.2
+##
+
+cfg {
+  name: "foo"
+  function_index: 1
+  node {
+    bb_id: 0
+    size: 10
+    out_edges {
+      sink : {
+        function_index: 1
+        bb_index: 1
+      }
+      weight: 5
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+  }
+  node {
+    bb_id: 1
+    size: 4
+    out_edges {
+      sink : {
+        function_index: 1
+        bb_index: 2
+      }
+      weight: 100
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+    out_edges {
+      sink : {
+        function_index: 2
+        bb_index: 0
+      }
+      weight: 100
+      kind: CALL
+    }
+  }
+  node {
+    bb_id: 2
+    size: 6
+    out_edges {
+      sink : {
+        function_index: 1
+        bb_index: 1
+      }
+      weight: 100
+      kind: BRANCH_OR_FALLTHROUGH
+    }
+  }
+}
+cfg {
+  name: "bar"
+  function_index: 2
+  node {
+    bb_id: 0
+    size: 2
+  }
+}
+cfg {
+  name: "baz"
+  function_index: 3
+  node {
+    bb_id: 0
+    size: 6
+    out_edges {
+      sink : {
+        function_index: 1
+        bb_index: 0
+      }
+      weight: 100
+      kind: CALL
+    }
+  }
+}