Backport 2020-02 enable embedded ppdb. (mono#19050)

Co-authored-by: Thays Grazia <thaystg@gmail.com>

Bump bockbuild for Pango nil check fix

Pango nil check fix: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1069059/

Brings in mono/bockbuild#153

Backport of mono#18936

Added some parenthesis and a cast to control order of operations. (mo…

…no#18984)

This fixes mono#17140; intermittent incorrect results from GetTotalBytesAllocated for current thread. uint64_t and a pointer difference are not the same type/width on all architectures, so incorrect results can happen with out the parenthesis.

Co-authored-by: Nathan Ricci <naricc@microsoft.com>

[sgen] Disable managed allocator when using nursery-canaries (mono#18946

)

The managed allocator included in a full aot image does not support canaries, leading to inconsistent object layout.

Fixes mono#18925

Co-authored-by: Vlad Brezae <brezaevlad@gmail.com>

[2019-12] [merp] Capture Environment.FailFast message in crash report (…

…mono#18921)

* [merp] Capture Environment.FailFast message in crash report

* [test] merp-crash-test refactor crasher data; add optional validator

Switch from a Tuple<T1,T2> to a struct for the crash items.  Add a third
optional validator field which is an action to run on the json blob that we get
back.

Not updating existing tests to do any json validation, yet.

* [test] Add new MERP crash test for Environment.FailFast

Check that the resulting json blob includes the failfast message.

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>

[2019-12] Make MonoWebRequestHandler linker friendly (mono#18833)

* Make MonoWebRequestHandler linker friendly

* Make MonoWebRequestHandler's ctor public (to be able to use in Activator.CreateInstance without binding flags)

* Remove Console.WriteLine from system.net.http

Co-authored-by: Egor Bogatov <egorbo@gmail.com>

[2019-12] Bump msbuild to track mono-2019-10 (mono#18862)

- Changes roslyn to 3.5.0-beta2-20074-05

Move offsets-tool into mono/tools (mono#18830)

Backporting this since we see errors during `pip install` on the Android Mono SDKs build on Linux and with this we're removing the call to pip (it wasn't needed).

Backport of mono#18783.

Co-authored-by: Alexander Köplinger <alex.koeplinger@outlook.com>

[2019-12] Bump msbuild to track mono-2019-10 (mono#18792)

* [2019-12] Bump msbuild to track mono-2019-10

* Bump roslyn to 3.5.0-beta3-20111-03 .

* Update nuget.exe to match xbuild

- the closest version available right now, to `5.5.0-rtm.6422` is
`5.5.0-preview2`, so using that for now.

Bump bockbuild to get GTK NSPasteboardType change.

Backport from mono#18080