Fix how Hydrogen traces inlined functions.

https://crrev.com/c3a6ca68d0646b10885ef7017557eaf463db2e4a changed what kind of information is dumped which broke some properties of the output that IRHydra relies on:

1. Because IRHydra does not have access to the whole scripts it relies on function sources dumps to map IR and deoptimization to the actual source. This means that source positions must be dumped in a way that allows for this mapping and previously we used positions relative to the beginning of the function to allow that. Now we are dumping absolute script positions which means that function sources must be annotated with the start position so that IRHydra (or any other similar tools) could translate absolute script positions into function-relative ones.

2. When dumping inlined functions we should dump which function are we inlining into because position itself is not enough to recover the inlining stack from the output.

BUG=

Review-Url: https://codereview.chromium.org/2573653002
Cr-Commit-Position: refs/heads/master@{#41663}

src/crankshaft/hydrogen.cc

@@ -1391,7 +1391,8 @@ void HGraphBuilder::TraceInlinedFunction(Handle<SharedFunctionInfo> shared,
         os << String::cast(source_name)->ToCString().get() << ":";
       }
       os << shared->DebugName()->ToCString().get() << ") id{";
-      os << info_->optimization_id() << "," << inlining_id << "} ---\n";
+      os << info_->optimization_id() << "," << inlining_id << "} start{";
+      os << shared->start_position() << "} ---\n";
       {
         DisallowHeapAllocation no_allocation;
         int start = shared->start_position();
@@ -1413,7 +1414,14 @@ void HGraphBuilder::TraceInlinedFunction(Handle<SharedFunctionInfo> shared,
     OFStream os(tracing_scope.file());
     os << "INLINE (" << shared->DebugName()->ToCString().get() << ") id{"
        << info_->optimization_id() << "," << inlining_id << "} AS "
-       << inlining_id << " AT " << position.ScriptOffset() << std::endl;
+       << inlining_id << " AT ";
+    if (position.IsKnown()) {
+      os << "<" << position.InliningId() << ":" << position.ScriptOffset()
+         << ">";
+    } else {
+      os << "<?>";
+    }
+    os << std::endl;
   }
 }