Enable HHIRBytecodeControlFlow by default

Summary: Bytecode controlflow is looking stable and perf-neutral, so let's turn it on and see how things go.

Reviewed By: @ottoni

Differential Revision: D1371626
re-enable mustache, mark the one failing test as flakey

Summary: No change to expect file as when I removed it from clownlylist and re-recorded, the file was still disabled on disk (needed blowing away, etst runner has now been modified)

Reviewed By: @bertmaher

Differential Revision: D1400141
Fixed 0e0 as a value on JSON_parser

Summary: We're using a heavily modified version of Dougles Crockford's JSON parsing library. That library has a bug that fails
to parse 0e0 as a value in an array or an object (as a value). This diff corrects the issue which also fixes a broken zend test

Reviewed By: @JoelMarcey

Differential Revision: D1393793
Fix preOptimize for CheckLoc and AssertLoc

Summary: In preOptimize, we convert CheckLoc/AssertLoc into CheckType/AssertType.
The return value of preOptimize should be the old FramePtr, not the
destination of the new instructions.

Reviewed By: @swtaarrs

Differential Revision: D1399908
Fix bug in insertLocalPhis()

Summary: We added a ldLoc but did not add the corresponding src-type constraint.

Reviewed By: @swtaarrs

Differential Revision: D1399896
Bug fix for JitLoop

Summary: We should add block id to region (instead of trans id).

Reviewed By: @ottoni

Differential Revision: D1399052
Introduce I/O wait enter/exit hooks

Summary: Introduce I/O wait enter/exit hooks, useful for profiling asynchronous
execution.

Reviewed By: @billf

Differential Revision: D1397075
Fix hhhbc for SetElem with non-array bases.

Summary: If the base is not an array or an object implementing ArrayAccess,
SetM pushes a null. This was not being handled correctly hhbbc, and
we were pushing the rhs on stack in these cases.

Reviewed By: @jdelong

Differential Revision: D1383973
Various fixes to access modifiers errors

Summary: HHVM would not error correctly for various error relating to multiple access modifiers on methods and functions. This diff matches the behavior of this to php.

Reviewed By: @ptarjan

Differential Revision: D1398889
Add missing removeKey for flakey option

Reviewed By: @JoelMarcey

Differential Revision: D1400965
Revert "[hack] don't recompute files with errors"

Summary: This reverts commit D1387289. There are cases when the
invariants listed don't actually hold, we need to think this through
more carefully.

Almost a clean revert -- one change to `serverTypeCheck` in D1390136
conflicted, pretty sure we can just nuke that change.

Reviewed By: @pikatchu

Differential Revision: D1401096
CallsNative flag on ir opcodes should imply MayRaiseError by default

Summary: We've been burned in the past by opcodes that can throw but weren't
marked as such. MayRaiseError is now opt-out on CallsNative opcodes, by using
NNE instead of N. I tried to audit each one that broke because of this and make
the right choise wrt NNE vs. adding a catch block.

Reviewed By: @bertmaher

Differential Revision: D1400014