[debugger] fix --print-break-location for multiline scripts.

src/debug/debug.cc

Index: src/debug/debug.cc
diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index ef170e59c7f7bc93c8fd3c6a2bcfea4bc0d5dee9..a15743dcd6e303dd1a0c67c31b371eccd4981b6f 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -2340,7 +2340,7 @@ void Debug::PrintBreakLocation() {
     int column = Script::GetColumnNumber(script, source_position);
     Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
     int line_start =
-        line == 0 ? 0 : Smi::cast(line_ends->get(line - 1))->value();
+        line == 0 ? 0 : Smi::cast(line_ends->get(line - 1))->value() + 1;
     int line_end = Smi::cast(line_ends->get(line))->value();
     DisallowHeapAllocation no_gc;
     String::FlatContent content = source->GetFlatContent();