See:
https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Fuzzer/28768

# Fatal error in ../../src/parsing/pattern-rewriter.cc, line 688
# unreachable code
#
#
#
#FailureMessage Object: 0x7ffc8bc4a020
==== C stack trace ===============================

    /b/s/w/ir/out/Debug/./libv8_libbase.so(v8::base::debug::StackTrace::StackTrace()+0x13) [0x7fa76d0871b3]
    /b/s/w/ir/out/Debug/./libv8_libplatform.so(+0x1070b) [0x7fa76d05a70b]
    /b/s/w/ir/out/Debug/./libv8_libbase.so(V8_Fatal(char const*, int, char const*, ...)+0x148) [0x7fa76d07e188]
    /b/s/w/ir/out/Debug/./libv8.so(+0x107a5be) [0x7fa76c32f5be]
    /b/s/w/ir/out/Debug/./libv8.so(v8::internal::PatternRewriter::Visit(v8::internal::AstNode*)+0x1f3) [0x7fa76c32c9c3]
    /b/s/w/ir/out/Debug/./libv8.so(v8::internal::PatternRewriter::VisitObjectLiteral(v8::internal::ObjectLiteral*, v8::internal::Variable**)+0x4b3) [0x7fa76c32cf03]
    /b/s/w/ir/out/Debug/./libv8.so(v8::internal::PatternRewriter::Visit(v8::internal::AstNode*)+0x4e) [0x7fa76c32c81e]
    /b/s/w/ir/out/Debug/./libv8.so(v8::internal::PatternRewriter::VisitAssignment(v8::internal::Assignment*)+0x194) [0x7fa76c32f2f4]
    /b/s/w/ir/out/Debug/./libv8.so(v8::internal::PatternRewriter::VisitArrayLiteral(v8::internal::ArrayLiteral*, v8::internal::Variable**)+0xe44) [0x7fa76c32ddb4]