Interpreted thread start routine gets a wrong "this" pointer

[janvorli]

The LocallocLarge_* codegen bringup test is failing due to an infinite recursion. It happens, because the "this" pointer passed to the interpreted ThreadData.Run() method is not the ThreadData defined in the test code, but System.Threading.ThreadStart.

[janvorli]

cc: @davidwrighton - sounds like a possible issue with delegates.

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