[PowerPC][AIX] Refactor existing logic to handle non-zero offsets for aix-small-local-dynamic-tls (#89182)

To enable optimized small local-dynamic access sequence for non-zero
offsets, this patch r

[PowerPC][AIX] Refactor existing logic to handle non-zero offsets for aix-small-local-dynamic-tls (#89182)

To enable optimized small local-dynamic access sequence for non-zero
offsets, this patch refactors existing
2a50921553798d2db52ca6330c89f0f8a5bc2215.

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[PowerPC][AIX] Enable aix-small-local-dynamic-tls target attribute (#86641)

Following the aix-small-local-exec-tls target attribute, this patch adds
a target attribute for an AIX-specific option in

[PowerPC][AIX] Enable aix-small-local-dynamic-tls target attribute (#86641)

Following the aix-small-local-exec-tls target attribute, this patch adds
a target attribute for an AIX-specific option in llc that informs the
compiler that it can use a faster access sequence for the local-dynamic
TLS model (formally named aix-small-local-dynamic-tls) when TLS
variables are less than ~32KB in size.

The patch either produces an addi/la with a displacement off of module
handle (return value from .__tls_get_mod) when the address is
calculated, or it produces an addi/la followed by a load/store when the
address is calculated and used for further accesses.

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Co-authored-by: Amy Kwan <amy.kwan1@ibm.com>

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[PowerPC][NFC] Add base test case for small-local-dynamic-tls on AIX (#84711)