Crashes in the interpreter.

Looks like this regressed at r40479 "[ignition] Eliminate hole checks where statically possible for loads and store". Adam could you take a look please.
es

Minimized repro:

eval("var x = 1");
const x = 2;

FWIW I think this is "just" a wrong assumption, the generated code should still work correctly.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/56626f302d7d29f05ca19cf6d79666c9aabceca7

commit 56626f302d7d29f05ca19cf6d79666c9aabceca7
Author: adamk <adamk@chromium.org>
Date: Tue Oct 25 11:07:33 2016

[ignition] Use more-targeted check for CONST-this-initialization hole check

This brings the BytecodeGenerator in line with FullCodeGenerator, now that
more requests for hole checks are flowing through BuildVariableAssignment.

BUG= chromium:658528 

Review-Url: https://codereview.chromium.org/2447783002
Cr-Commit-Position: refs/heads/master@{#40557}

[modify] https://crrev.com/56626f302d7d29f05ca19cf6d79666c9aabceca7/src/interpreter/bytecode-generator.cc
[add] https://crrev.com/56626f302d7d29f05ca19cf6d79666c9aabceca7/test/mjsunit/regress/regress-crbug-658528.js

ClusterFuzz has detected this issue as fixed in range 40556:40557.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5961478224216064

Fuzzer: decoder_langfuzz
Job Type: linux_asan_d8_ignition_v8_arm_dbg
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  variable->is_this() && variable->mode() == CONST && op == Token::INIT in bytecod
  
Regressed: V8: r40478:40479
Fixed: V8: r40556:40557

Minimized Testcase (8.40 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96fjAvmJoaZorr4YErytgJM363PnXVHXZ6dPnIAtDVkUN_cZ7PvQZcMkVSoRDo3D6-rAjMInNtkzQGlDov5kkHpKJvGBiEUUPcKNH-hByFXFQ3mkWWKtBxMvAnSVlcqyTlM1AWlJpzvigeDpH5eaaIfDVu2gg?testcase_id=5961478224216064

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

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

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