Move SourcePosition into separate header file.

src/crankshaft/lithium-codegen.cc

Index: src/crankshaft/lithium-codegen.cc
diff --git a/src/crankshaft/lithium-codegen.cc b/src/crankshaft/lithium-codegen.cc
index 5bd1e6a9b872426627bc306eb5bbec9f95b64306..c5b7e9c470e805799faee77cd59534fa1dba4840 100644
--- a/src/crankshaft/lithium-codegen.cc
+++ b/src/crankshaft/lithium-codegen.cc
@@ -154,7 +154,9 @@ void LCodeGenBase::Comment(const char* format, ...) {
 
 
 void LCodeGenBase::DeoptComment(const Deoptimizer::DeoptInfo& deopt_info) {
-  masm()->RecordDeoptReason(deopt_info.deopt_reason, deopt_info.position);
+  SourcePosition position = deopt_info.position;
+  int raw_position = position.IsUnknown() ? 0 : position.raw();
+  masm()->RecordDeoptReason(deopt_info.deopt_reason, raw_position);
 }