Revert of Encode interpreter::SourcePositionTable as variable-length ints.

test/unittests/interpreter/source-position-table-unittest.cc

-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/v8.h"
-
-#include "src/interpreter/source-position-table.h"
-#include "test/unittests/test-utils.h"
-
-namespace v8 {
-namespace internal {
-namespace interpreter {
-
-class SourcePositionTableTest : public TestWithIsolateAndZone {
- public:
-  SourcePositionTableTest() {}
-  ~SourcePositionTableTest() override {}
-};
-
-// Some random offsets, mostly at 'suspicious' bit boundaries.
-static int offsets[] = {0,   1,   2,    3,    4,     30,      31,  32,
-                        33,  62,  63,   64,   65,    126,     127, 128,
-                        129, 250, 1000, 9999, 12000, 31415926};
-
-TEST_F(SourcePositionTableTest, EncodeStatement) {
-  SourcePositionTableBuilder builder(isolate(), zone());
-  for (int i = 0; i < arraysize(offsets); i++) {
-    builder.AddStatementPosition(offsets[i], offsets[i]);
-  }
-
-  // To test correctness, we rely on the assertions in ToSourcePositionTable().
-  // (Also below.)
-  CHECK(!builder.ToSourcePositionTable().is_null());
-}
-
-TEST_F(SourcePositionTableTest, EncodeExpression) {
-  SourcePositionTableBuilder builder(isolate(), zone());
-  for (int i = 0; i < arraysize(offsets); i++) {
-    builder.AddExpressionPosition(offsets[i], offsets[i]);
-  }
-  CHECK(!builder.ToSourcePositionTable().is_null());
-}
-
-TEST_F(SourcePositionTableTest, EncodeAscending) {
-  SourcePositionTableBuilder builder(isolate(), zone());
-
-  int accumulator = 0;
-  for (int i = 0; i < arraysize(offsets); i++) {
-    accumulator += offsets[i];
-    if (i % 2) {
-      builder.AddStatementPosition(accumulator, accumulator);
-    } else {
-      builder.AddExpressionPosition(accumulator, accumulator);
-    }
-  }
-
-  // Also test negative offsets:
-  for (int i = 0; i < arraysize(offsets); i++) {
-    accumulator -= offsets[i];
-    if (i % 2) {
-      builder.AddStatementPosition(accumulator, accumulator);
-    } else {
-      builder.AddExpressionPosition(accumulator, accumulator);
-    }
-  }
-
-  CHECK(!builder.ToSourcePositionTable().is_null());
-}
-
-}  // namespace interpreter
-}  // namespace internal
-}  // namespace v8