Temporarily stop the ini_get_all_* test pain

Summary: Before we have a mutiny, we should rethink how we want this test to optimally work.
Apparently the value of some runtime options change more often than first thought.

So, skipping the test for now, until we come up with the right solution. Options are:

  # Whitelist only the option names and values that are likely to be used externally and we want to track. **What are those options?**
  # Have the test only catch name changes, additions, removals? This would lessen pain, but could still cause minor annoyance.
  # Get rid of this test completely and document the settings in code and make sure we have detailed code review on option changes? **Brainstorm: Is an arc diff hook possible here??**

Reviewed By: @jdelong

Differential Revision: D1609762
Raise calls in vasm to new vcall instruction

Summary: vcall encapsulates much more information about a call than the raw
call instruction, which is necessary for emitting llvm from vasm. For direct
x64 code generation, a lowering pass converts the vcall into what would've been
emitted before this diff.

Reviewed By: @maksfb

Differential Revision: D1593725
Remove Vout::m_area

Summary: It should always point to a valid block, so just get the area from
that.

Reviewed By: @maksfb

Differential Revision: D1602828
Vasm pretty printing part 3

Summary: The register allocation phase inserts a lot of instructions
without giving them origins. This patch fixes that.

Reviewed By: @swtaarrs

Differential Revision: D1607032
Fixed vfsstream touch test cases.

Summary: Expose STREAM_META_ constants to hhvm runtime.
Closes https://github.com/facebook/hhvm/pull/3955

Reviewed By: @paulbiss

Differential Revision: D1610551
Use FixedVector for Class::m_[sp]initVec

Summary: This saves 32 bytes, bringing Class down to 280 in the lowptr build.
It's not quite a size class down yet, but it gets us that much closer.

Reviewed By: @jdelong

Differential Revision: D1609365
Shrink Class to 256 bytes

Summary: Shrink some fields that seem like they can be safely shrunk, apply
LowPtr, and move some stuff around.  Also reduce SProp from 56 to 48 bytes by
moving a field.

Reviewed By: @jdelong

Differential Revision: D1610488