backtrace of failure after collapse_strands optimization

gistfile1.txt

$ perl6 --ll-exception t/spec/S02-literals/quoting.t
Not the same matching
   at gen/moar/stage2/QRegex.nqp:1450  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/QRegex.moarvm:!cursor_init)
 from SETTING::src/core/Str.pm:981  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:match)
 from SETTING::src/core/Str.pm:950  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:match)
 from SETTING::src/core/Str.pm:475  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:comb)
 from SETTING::src/core/Str.pm:2653  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:de-indent)
 from SETTING::src/core/Str.pm:2642  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:indent)
 from SETTING::src/core/Str.pm:2608  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/CORE.setting.moarvm:indent)
 from gen/moar/Perl6-Actions.nqp:676  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Actions.moarvm:descend)
 from gen/moar/Perl6-Actions.nqp:690  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Actions.moarvm:descend)
 from gen/moar/Perl6-Actions.nqp:701  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Actions.moarvm:)
 from gen/moar/Perl6-Actions.nqp:660  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Actions.moarvm:trim_heredoc)
 from src/Perl6/Grammar.nqp:195  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:)
 from src/Perl6/Grammar.nqp:174  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:)
 from src/Perl6/Grammar.nqp:171  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:heredoc)
 from <unknown>:1  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:_ws)
 from src/Perl6/Grammar.nqp:653  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:ws)
 from src/Perl6/Grammar.nqp:1265  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:statementlist)
 from gen/moar/stage2/NQPHLL.nqp:1118  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:LANG)
 from src/Perl6/Grammar.nqp:1699  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:FOREIGN_LANG)
 from src/Perl6/Grammar.nqp:1229  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:comp_unit)
 from src/Perl6/Grammar.nqp:531  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Grammar.moarvm:TOP)
 from gen/moar/stage2/QRegex.nqp:2330  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/QRegex.moarvm:parse)
 from gen/moar/stage2/NQPHLL.nqp:1886  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:parse)
 from gen/moar/stage2/NQPHLL.nqp:1802  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:execute_stage)
 from gen/moar/stage2/NQPHLL.nqp:1835  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:run)
 from gen/moar/stage2/NQPHLL.nqp:1838  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:)
 from gen/moar/stage2/NQPHLL.nqp:1824  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:compile)
 from gen/moar/stage2/NQPHLL.nqp:1524  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:eval)
 from gen/moar/stage2/NQPHLL.nqp:1779  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:evalfiles)
 from gen/moar/stage2/NQPHLL.nqp:1704  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:command_eval)
 from src/Perl6/Compiler.nqp:42  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/Perl6/Compiler.moarvm:command_eval)
 from gen/moar/stage2/NQPHLL.nqp:1630  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:command_line)
 from gen/moar/main.nqp:47  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:MAIN)
 from gen/moar/main.nqp:38  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<mainline>)
 from <unknown>:1  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<main>)
 from <unknown>:1  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<entry>)