Convert exception throwing JIT helpers to managed code.

[AaronRobinsonMSFT]

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[AaronRobinsonMSFT]

This is going to fail for R2R images during Module::RunEagerFixups() - see below. I wonder if this can be narrowed to be "valid" if the image is SPCL?

runtime/src/coreclr/vm/ceeload.cpp

Lines 3470 to 3487 in e95eaf0

	#ifdef _DEBUG
	// Loading types during eager fixup is not a tested scenario. Make bugs out of any attempts to do so in a
	// debug build. Use holder to recover properly in case of exception.
	class ForbidTypeLoadHolder
	{
	public:
	ForbidTypeLoadHolder()
	{
	BEGIN_FORBID_TYPELOAD();
	}
	~ForbidTypeLoadHolder()
	{
	END_FORBID_TYPELOAD();
	}
	}
	forbidTypeLoad;
	#endif

[jkotas]

LGTM. Thanks!

[AaronRobinsonMSFT]

/ba-g All unrelated failures.