[interpreter] Switch context during stack unwinding.

src/compiler/bytecode-graph-builder.h

Index: src/compiler/bytecode-graph-builder.h
diff --git a/src/compiler/bytecode-graph-builder.h b/src/compiler/bytecode-graph-builder.h
index 8fd20a1d20450b5be50551435417bd3dcd028599..9db0687713d865f4340e2d71903631b6c9b5e6f8 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -173,9 +173,10 @@ class BytecodeGraphBuilder {
   // underlying bytecode. The exception handlers within the bytecode are
   // well scoped, hence will form a stack during iteration.
   struct ExceptionHandler {
-    int start_offset_;    // Start offset of the handled area in the bytecode.
-    int end_offset_;      // End offset of the handled area in the bytecode.
-    int handler_offset_;  // Handler entry offset within the bytecode.
+    int start_offset_;      // Start offset of the handled area in the bytecode.
+    int end_offset_;        // End offset of the handled area in the bytecode.
+    int handler_offset_;    // Handler entry offset within the bytecode.
+    int context_register_;  // Index of register holding handler context.
   };
 
   // Field accessors