Defer JIT compile of bulk of Program.Main

[drewnoakes]

The JIT must load all types used in a method when the method is loaded.

Program.Main attempts to hook type initialisation exceptions via NBug.

Loading fewer types in Main increases the chance of catching such exceptions.

Other than that, there is no change to program behaviour.

What did I do to test the code and ensure quality:

• Manual testing

Has been tested on:

• GIT 2.16
• Windows 10

[codecov]

Codecov Report

Merging #4645 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4645   +/-   ##
=======================================
  Coverage   26.62%   26.62%           
=======================================
  Files         505      505           
  Lines       41117    41117           
  Branches     6006     6006           
=======================================
  Hits        10946    10946           
  Misses      29671    29671           
  Partials      500      500

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