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Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/c2a778621cbcd812e2687269ba3f10132a31df12 ([Zucchini] Add dissassembler_dex Fuzzer).

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d550e67840653dd68f49cdab0e58ca7268359bb9

commit d550e67840653dd68f49cdab0e58ca7268359bb9
Author: Calder Kitagawa <ckitagawa@chromium.org>
Date: Wed Jul 04 15:29:58 2018

[Zucchini] Fix undefined shift in GetSleb128.

A left shift resulting in truncation is undefined behavior on signed
int types in C++. It is fine to left shift an unsigned type because
there is no issues with two's complement representation or sign bits.
To get around this we need to perform the shift on the uint type and
recast it to a signed int type.

Bug:  860067 
Change-Id: Ibace5aceb17c4435d6d37d5e37a16fa781c7dd99
Reviewed-on: https://chromium-review.googlesource.com/1126169
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572577}
[modify] https://crrev.com/d550e67840653dd68f49cdab0e58ca7268359bb9/components/zucchini/buffer_source.cc

ClusterFuzz has detected this issue as fixed in range 572576:572579.

Detailed report: https://clusterfuzz.com/testcase?key=4696006634242048

Fuzzer: libFuzzer_zucchini_disassembler_dex_fuzzer
Job Type: libfuzzer_chrome_ubsan
Platform Id: linux

Crash Type: Undefined-shift
Crash Address: 
Crash State:
  zucchini::BufferSource::GetSleb128
  zucchini::CodeItemParser::GetNext
  zucchini::DisassemblerDex::ParseHeader
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=572200:572205
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_ubsan&range=572576:572579

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4696006634242048

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 4696006634242048 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.