[AMDGPU] Fix DynLDS causing crash when LowerLDS is run at fullLTO pipeline (#96038)

Direct mapped dynamic LDS is not lowered in the LowerLDSModule pass.
Hence it is not marked with an absolute symb

[AMDGPU] Fix DynLDS causing crash when LowerLDS is run at fullLTO pipeline (#96038)

Direct mapped dynamic LDS is not lowered in the LowerLDSModule pass.
Hence it is not marked with an absolute symbol. When the LowerLDS pass is
rerun in LTO, compilation fails with an assert "cannot mix abs and non-abs LDVs".
This patch adds an additional check for direct mapped dynLDS to skip the assert.

Fixes SWDEV-454281

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[AIX][tests] Disable failing tests on AIX

These new tests are failing on the AIX bot because the -I option isn't supported.

Disable these tests for now until they can be fixed.

[AMDGPU] Let LowerModuleLDS run twice on the same module (#81729)

If all variables in the module are absolute, this means we're running
the pass again on an already lowered module, and that works.

[AMDGPU] Let LowerModuleLDS run twice on the same module (#81729)

If all variables in the module are absolute, this means we're running
the pass again on an already lowered module, and that works.
If none of them are absolute, lowering can proceed as usual.
Only diagnose cases where we have a mix of absolute/non-absolute GVs,
which means we added LDS GVs after lowering, which is broken.

See #81491
Split from #75333

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