Add second argument to assert()

Summary: Fixes #3293 and #3570.
Closes https://github.com/facebook/hhvm/pull/3578

Reviewed By: @sgolemon

Differential Revision: D1519076
Update slim, increase delta for flakey test

Summary: Facebook: Leaving in contbuild because still 100% with isolate

Reviewed By: @JoelMarcey

Differential Revision: D1518661
Static string table memory usage

Summary: Add tracking of the size in bytes of the static string table to admin memory page

Reviewed By: @markw65

Differential Revision: D1514032
Fix handling of pcre overflow expressions

Summary: Couple of fixes to the handling of pcre compiled expressions that overflow the default pcre cache:

s_pcre_globals should smart-free m_overflow at the end of the request, and should free() the set of overflow expressions themselves.

Reviewed By: @markw65

Differential Revision: D1503955
Upodate idl to hni converter

Summary: We now handle variadics, paramcoercenull,
and the correct foldable flag.

Reviewed By: @JoelMarcey

Differential Revision: D1519934
Rewrite misc.idl.json to HNI

Summary: This pull request moves the functions in misc.idl.json to HNI.

Part of #1480
Closes https://github.com/facebook/hhvm/pull/3525

Reviewed By: @fredemmott

Differential Revision: D1506187

Pulled By: @sgolemon
stristr should accept before_needle parameter

Summary: fixes #3520

The third parameter of stristr is currently unsupported.

Refer to https://github.com/facebook/hhvm/issues/3520 for more information.

Reviewed By: @fredemmott

Differential Revision: D1514703
Handle exact substring matches within fuzzy search

Summary: This addresses what was mentioned here: https://www.prod.facebook.com/groups/devtools.feedback/permalink/720320464683238/

In any case where the letter expected in the exact match appeared beforehand somewhere in the string, we ignored the exact match case.  This handles that, so any time we find an exact substring match we'll score it properly.

Reviewed By: @joelbeales

Differential Revision: D1517792
Check for OOM during json decoding

Summary: json parsing can create massively big objects from relatively small
strings, so check for OOM during parsing.

Reviewed By: @markw65

Differential Revision: D1516420
Fix typos in hh_client manpage.

Summary: Typos are awful.

Reviewed By: @fredemmott

Differential Revision: D1520699
typechecker: Improve error messages for casting.

Summary: Raise semantic errors for object casts, instead of parse errors

Reviewed By: @elgenie

Differential Revision: D1513322
flakeylist socket_create_listen

Summary: This failed 8 times yesterday after my rand fix. Lets just kill it since tests without retries and binding are horrible.

Reviewed By: @fredemmott

Differential Revision: D1520240
Don't print destroyed locals with TRACE=bcinterp

Summary: Stack::toString() was printing the local values from callers, but when
we've reentered to run a destructor some of those locals might already be
destroyed.

Reviewed By: @alexmalyshev

Differential Revision: D1518133
Don't run __sleep when serializing objects for the debugger wire protocol

Summary: Running __sleep while serializing objects for the debugger can break
the protocol, e.g., if a breakpoint is hit while generating a backtrace.  It
seems doubtful that the user of the debugger actually wants to trigger __sleep
via debugger commands.

Reviewed By: @markw65

Differential Revision: D1519537
fix test

Summary: I'm so angry at you@​aravind for ruining such a good test day.

https://www.facebook.com/pxlcld/lxd9

Reviewed By: @alexmalyshev

Differential Revision: D1521427