[mono][debugger] Fix inspect gchandle

[thaystg]

We are not sending IntPtr as ValueType anymore because it was causing an infinity recursion because IntPtr has a field pointing to itself. So we need support receiving the IntPtr as I8.

Without the PR:
New Debugger Engine:

Old Debugger Engine:

With the PR:
New Debugger Engine:

Old Debugger Engine:

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[lewing]

Is there any chance we need to handle I4 here too for 32 bit runtimes?

[thaystg]

Is there any chance we need to handle I4 here too for 32 bit runtimes?

I don't think so, we are always sending it as a long value:

runtime/src/mono/mono/component/debugger-agent.c

Line 5282 in fc5b6e7

buffer_add_byte (buf, MONO_TYPE_PTR);

Also every PTR we always send as a long value:

runtime/src/mono/mono/component/debugger-agent.c

Line 5157 in fc5b6e7

gssize val = *(gssize*)addr;

[thaystg]

Can I get a review?