Don't preemptively optimize away conditional jumps

There may be a stack adjustment needed.

Reviewed By: @ottoni

Differential Revision: D1124766
Print test commands when --verbose is present in test/run

Sometimes I want to see the command to run a test even if it's not
failing.

Reviewed By: @ptarjan

Differential Revision: D1114189
Document TakeStack better, emit it in fewer situations

There was no obvious context for why it was being emitted in
simplifyLdStack, and we don't need to emit it if the new value is already from
a raw load.

Reviewed By: @edwinsmith

Differential Revision: D1114188
HHVM MySQL corrections for bogus connections

Followup to https://github.com/facebook/hhvm/commit/76cab4dd67c3b20ad64927ada9bd71d0c4

Reviewed By: @ptarjan

Differential Revision: D1124285
Remove s_file_mutex from util.cpp

Apparently dead.

Reviewed By: @bertmaher

Differential Revision: D1124735
Move LogFileFlusher to its own header

Out of util.h.  For now, put drop_caches into
compatability.h, but that could easily turn into a blob-header also if
we're not careful.  Also made some style changes: make the virtual
private (virtual functions should rarely be protected), override
keyword, non-static member initializer, s/class/struct/.

Reviewed By: @edwinsmith

Differential Revision: D1124736
Remove includes of util.h from util/ headers

Few of them were using functions exported by util.h, they
were just using it to grab things like std::map.  Fixed some
downstream direct-includes.  Where trivial, used folly or boost
instead of Util::.

Reviewed By: @ptarjan

Differential Revision: D1124738
Remove includes of util.h from .cpp files in hphp/util

Replace some uses with folly functions or boost.  I kept
string_vsnprintf in its own header for now.  We could probably move it
to folly/String.h (folly has stringPrintf and such, just no vararg
version), but on the other hand using va_list is not very encouraged
so maybe we should just leave it here for these legacy uses.

Reviewed By: @ptarjan

Differential Revision: D1124742
Let systemlib units go through hhbbc

After the change to include systemlib in hphpc's static
analysis, I temporarily cut them out of whole_program in HHBBC.  The
problem was just that systemlib needs to end up merge only, but none
of hhbbc's output units are merge only.  Solve this with a special
case in emit.cpp for now.

This seems to make a ~2x slow down in how long the first analyze pass
takes hhbbc.  I think the reason is that now *tons* of things are
registering dependencies to common builtins that didn't use to
(e.g. idx)---it seems to be spending a lot of time on the single lock
there now.  (Will probably change it to tbb ...)

Reviewed By: @dariorussi

Differential Revision: D1125024
Add support for "bumping" trace levels, use it to not trace systemlib in hhbbc

Use this so systemlib units will only be traced if the level
is higher than normal.

Reviewed By: @edwinsmith

Differential Revision: D1125039
Use tbb::concurrent_hash_map for the Index dependency map

It was previously just a std::mutex around a
std::unordered_map, which seems to be a big source of contention after
putting systemlib is in the mix.

Reviewed By: @edwinsmith

Differential Revision: D1125048
Fix hhbbc issues with magic builtin interfaces (KeyedTraversable, etc)

After turning on hhbbc on systemlib, these interface names
are statically resolved, so it was assuming things like $x instanceof
Traversable is only true if $x is an object, and that an array
couldn't pass one of those parameter type hints.

Reviewed By: @dariorussi

Differential Revision: D1125061
Missing things in HHBBC representation: HNI types and isAsync

Now that HHBBC compiles systemlib, it needs to support
passing HNI-native function return types.  Also I apparently missed
isAsync only on the parse side (a newish test caught it).

I made native info a struct even though it only has one thing so
far---I think later we'll want the function pointer and a flag about
whether we can invoke it with constant arguments during compilation
time.

Reviewed By: @edwinsmith

Differential Revision: D1125080
Clean up a few TODOs relating to analyzing builtins in hhbbc

Some cases in class resolution that were happening for
builtins now won't (I checked).  They are mostly just "in principle"
possible now, and shouldn't really happen as far as I know aside from
one case: if you put "implements Foo" and Foo is actually a class.  I
can't get hphpc to mark AttrUnique on anything that would fail in
those places other than that.

Reviewed By: @edwinsmith

Differential Revision: D1125093
Add FP, SP to hhirTracelet tracing

Adding this was pretty helpful for tracking down a stack
corruption bug.

Reviewed By: @swtaarrs

Differential Revision: D1125781
fix fastcgi segfaults a better way

I think this is what julk originally wanted. He has a `m_keepConn` boolean that is set by `ConnectionFlags::KEEP_CONN` and if that is false, he calls this callback in both the error and the success case.

This doesn't segfault when the connection is abruptly closed by the requestor.

Closes #1522

Reviewed By: @scannell

Differential Revision: D1124995
Rename hphp-value.cpp/h to typed-value

Since it defines class TypedValue

Reviewed By: @bertmaher

Differential Revision: D1125416
Convert ext/phar to HNI

Closes #1548

Reviewed By: @sgolemon

Differential Revision: D1125469

Pulled By: @scannell
Set HTTPS header appropriately in fastcgi

Check passed header values for HTTPS.

IIS sets this header to "off" so check for that and empty value before
using transport->setSSL().

Only change to lower case if the value is not empty for performance.

Closes #1546

Reviewed By: @ptarjan

Differential Revision: D1125440

Pulled By: @scannell