[SPARC][IAS] Emit the correct ELF machine type (#96583)

Emit the correct machine type when writing out ELF objects.
This patch is modeled on GCC's behavior:
- `-m32` emits an object of type EM_SPARC;
- `-m32 -mcpu=v9` emits EM_SPARC32PLUS (however, see below); and
- `-m64` emits EM_SPARCV9.

Note that GCC does not guarantee emission of EM_SPARC32PLUS objects,
since GNU as doesn't support user control of emitted machine type.
It will always autodetect the type based on the instruction mix:
- If there's a V9 instruction inside, then emit EM_SPARC32PLUS; and
- Emit EM_SPARC otherwise.

For LLVM we choose deterministic behavior instead for simplicity.

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