test: move long-running test to sequential

test-buffer-creation-regression is flaky on some SmartOS hosts in CI,
timing out. Move to sequential so it does not compete with other tests
for resources. Reduce three test cases to just the one needed to
identify the regression.

Author: Trott

test/parallel/test-buffer-creation-regression.js

@@ -0,0 +1,36 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+
+function test(arrayBuffer, offset, length) {
+  const uint8Array = new Uint8Array(arrayBuffer, offset, length);
+  for (let i = 0; i < length; i += 1) {
+    uint8Array[i] = 1;
+  }
+
+  const buffer = Buffer.from(arrayBuffer, offset, length);
+  for (let i = 0; i < length; i += 1) {
+    assert.strictEqual(buffer[i], 1);
+  }
+}
+
+const acceptableOOMErrors = [
+  'Array buffer allocation failed',
+  'Invalid array buffer length'
+];
+
+const size = 8589934592; /* 1 << 33 */
+const offset = 4294967296; /* 1 << 32 */
+const length = 1000;
+let arrayBuffer;
+
+try {
+  arrayBuffer = new ArrayBuffer(size);
+} catch (e) {
+  if (e instanceof RangeError && acceptableOOMErrors.includes(e.message))
+    return common.skip(`Unable to allocate ${size} bytes for ArrayBuffer`);
+  throw e;
+}
+
+test(arrayBuffer, offset, length);