[sgen] Reverse the free-list after sweeping to be in address-order.
[sgen] Our bzero()/memmove() must store “volatile”, lest LLVM screw us.
[sgen] Explain a FIXME.
[jit] Disable the optimized lmf push/pop code even if the arch specific code enables if it is not supported.
[jit] Use mini_type_get_underlying type in a few missing places int the amd64 port.
[jit] Use mini_type_get_underlying type in a few missing places in the x86 port.
[jit] Use mini_type_get_underlying in a few missing places in the jit.
[jit] Use mini_type_get_underlying in a few missing places in the jit.
[PCL]: Add "System.Dynamic.Runtime.dll" Facade Assembly to MonoTouch.

Added the type-forwarder for `ConditionalWeakTable<T,V>', put all the
others inside a `!FULL_AOT_RUNTIME' conditional, then enabled this in
the MonoTouch build.
[corlib]: Add 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken' stub.
[PCL]: Add new 'System.Runtime.InteropServices.WindowsRuntime' Facade Assembly.

FIXME: This is only a stub, the only type currently present is
       `System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken',
       which is only a stub.
[corlib]: Add stubs for the remaining `System.Runtime.InteropServices.WindowsRuntime' APIs.
[tests] Fix some corlib unit tests to run successfully on iOS
Stub implementation of EndGetRequestStream overload in HttpWebRequest.cs

I am not sure if a "do-nothing" implementation like this is acceptable in the Mono code base, but it does solve the problem described in https://bugzilla.xamarin.com/show_bug.cgi?id=12875 (successfully executing simple requests using the Google API .NET client library).
[arch]Add cvtsi2ss to amd64 codegen.
[jit]Emit explicit float rounding on amd64. Fixes #15987
[jit]Reenable int/long/double -> float rounding tests.
[jit] Fix a problem in the liveness pass, where the variable which was only used in the first instruction of the first bblock was incorrectly marked as dead.
Make a test work in the presence of llvm optimizations.
[mcs] Clone labeled statements cache in probing mode. Fixes #16376