[NativeAOT-LLVM] Fix EH with table-disjoint mutually protecting handlers

[SingleAccretion]

As it turns out, EH table entries of mutually protecting handlers do not have to be immediately adjacent (despite what some comments in the Jit claim...). The dispatch code I wrote some time back made such an assumption, and this change fixes that.

Fixes #2641.

[SingleAccretion]

Here's the EH table from the test:

***************  Exception Handling table
index  eTry, eHnd
  0  ::   6        - Try at BB02..BB02 [000..00C), Handler at BB03..BB03 [00C..015)
  1  ::   4     6  - Try at BB05..BB05 [016..022), Handler at BB06..BB06 [022..02B)
  2  ::   3     4  - Try at BB08..BB08 [02C..038), Handler at BB09..BB09 [038..041)
  3  ::   8     4  - Try at BB08..BB10 [02C..043), Finally at BB11..BB11 [043..04F)
  4  ::   5     6  - Try at BB05..BB05 [016..022), Handler at BB07..BB12 [02B..051)
  5  ::   8     6  - Try at BB05..BB05 [016..022), Handler at BB13..BB13 [051..05A)
  6  ::   7        - Try at BB02..BB02 [000..00C), Handler at BB04..BB14 [015..05C)
  7  ::   8        - Try at BB02..BB02 [000..00C), Handler at BB15..BB15 [05C..065)
  8  ::            - Try at BB02..BB15 [000..065), Finally at BB16..BB16 [065..06C)

There are two sets of mutually protecting handlers: {H0, H6, H7} and {H1, H4, H5}.

[SingleAccretion]

@dotnet/nativeaot-llvm

[yowl]

Thanks, LGTM