[interpreter] Ensure optimizations preserve source positions.

test/cctest/BUILD.gn

Index: test/cctest/BUILD.gn
diff --git a/test/cctest/BUILD.gn b/test/cctest/BUILD.gn
index 1461c920ee1fe08844d5bda189f291c9bca757ed..f178f4826256b1c3c594c214594692a37b02152e 100644
--- a/test/cctest/BUILD.gn
+++ b/test/cctest/BUILD.gn
@@ -71,9 +71,12 @@ executable("cctest") {
     "interpreter/bytecode-expectations-printer.cc",
     "interpreter/bytecode-expectations-printer.h",
     "interpreter/interpreter-tester.cc",
+    "interpreter/source-position-matcher.cc",
+    "interpreter/source-position-matcher.h",
     "interpreter/test-bytecode-generator.cc",
     "interpreter/test-interpreter-intrinsics.cc",
     "interpreter/test-interpreter.cc",
+    "interpreter/test-source-positions.cc",
     "libsampler/test-sampler.cc",
     "print-extension.cc",
     "profiler-extension.cc",