Add source position information to profile

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
diff --git a/runtime/vm/flow_graph_compiler.cc b/runtime/vm/flow_graph_compiler.cc
index 0c18be77c3c3da8ecc7fd71023b2477c2d9d0a9e..d4647fd5fa26542dc788846bd6f42cff3b17dee9 100644
--- a/runtime/vm/flow_graph_compiler.cc
+++ b/runtime/vm/flow_graph_compiler.cc
@@ -542,7 +542,11 @@ void FlowGraphCompiler::VisitBlocks() {
               IntervalStruct(prev_offset, prev_inlining_pos, prev_inlining_id));
           prev_offset = assembler()->CodeSize();
           prev_inlining_id = instr->inlining_id();
-          prev_inlining_pos = inline_id_to_token_pos_[prev_inlining_id];
+          if (prev_inlining_id < inline_id_to_token_pos_.length()) {

[srdjan, 2016/03/02 19:02:55]

Add comment something like: id_to_token_pos is added later when encountering a
call

[Cutch, 2016/03/02 19:14:07]

Done.

+            prev_inlining_pos = inline_id_to_token_pos_[prev_inlining_id];
+          } else {
+            prev_inlining_pos = TokenPosition::kNoSource;
+          }
           if (prev_inlining_id > max_inlining_id) {
             max_inlining_id = prev_inlining_id;
           }