NativeAOT-LLVM: Fix order of catch and second pass + calling finally twice

[yowl]

This PR fixes a couple of issues with the LLVM IL backend for exception handling. The second pass handler is now called before the catch (oops), and the finally block when adjacent to a catch, is only now called once.

I expect there are other problems, but at least this fixes 2 big ones and allows

runtimelab/src/coreclr/nativeaot/System.Private.CoreLib/src/System/Runtime/CompilerServices/ClassConstructorRunner.cs

Lines 109 to 115 in f9cf5b0

	finally
	{
	cctors[cctorIndex].HoldingThread = ManagedThreadIdNone;
	NoisyLog("Releasing cctor lock, cctor={0}, thread={1}", pfnCctor, currentManagedThreadId);
	cctorLock.Release();
	}

to throw without dying in the Release

Long term wasm-exceptions may help depending on how close the semantics are to .net I guess.

cc @SingleAccretion

[yowl]

closes #1990

[jkotas]

I think you will need to port everything in dotnet/runtime#75294 to fix the macOS build failures.

[yowl]

I think you will need to port everything in dotnet/runtime#75294 to fix the macOS build failures.

Thanks I was having a bit of a problem

[jkotas]

Is this needed? We have set tryRegionIdx = MaxTryRegionIdx; before the loop.

[yowl]

No, deleted. Thanks