[interpreter] Ensure optimizations preserve source positions.

test/cctest/cctest.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 73 matching lines @@
         'compiler/test-run-native-calls.cc',
         'compiler/test-run-stackcheck.cc',
         'compiler/test-run-stubs.cc',
         'compiler/test-run-variables.cc',
         'compiler/test-run-wasm-machops.cc',
         'compiler/test-simplified-lowering.cc',
         'cctest.cc',
         'expression-type-collector.cc',
         'expression-type-collector.h',
         'interpreter/interpreter-tester.cc',
+        'interpreter/source-position-matcher.cc',
+        'interpreter/source-position-matcher.h',
         'interpreter/test-bytecode-generator.cc',
         'interpreter/test-interpreter.cc',
         'interpreter/test-interpreter-intrinsics.cc',
+        'interpreter/test-source-positions.cc',
         'interpreter/bytecode-expectations-printer.cc',
         'interpreter/bytecode-expectations-printer.h',
         'gay-fixed.cc',
         'gay-precision.cc',
         'gay-shortest.cc',
         'heap/heap-tester.h',
         'heap/heap-utils.cc',
         'heap/heap-utils.h',
         'heap/test-alloc.cc',
         'heap/test-array-buffer-tracker.cc',
@@ skipping 337 matching lines @@
             '../../gypfiles/isolate.gypi',
           ],
           'sources': [
             'cctest.isolate',
           ],
         },
       ],
     }],
   ],
 }