JIT: mcs dumpMap broken on at least one recent collection

[AndyAyersMS]

For the current NAOT collection it just prints this and then fails

mcs -dumpMap d:\spmi\mch\748cd07e-c686-4085-8f5f-54c1b9cff44c.windows.x64\smoke_tests.nativeaot.windows.x64.checked.mch
index,method name,full signature,jit flags,os
1,<Module>:.cctor,"static void .cctor()",  DEBUG_INFO READYTORUN PREJIT RELOC USE_PINVOKE_HELPERS, 0
2,System.Func`5:Invoke,"class System.__Canon Invoke[System.__Canon, System.__Canon, System.__Canon

I have seen this before, there are some places where we should be able to recover from missing info but don't.

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