[lld] [ELF,SPARC] Accept EM_SPARC32PLUS inputs on the 32-bit SPARC target (PR #228201)

[Imre Kaloz via llvm-commits]

kaloz wrote:

Depends on #228197
Depends on #228200
The first 2 commits are from the base PRs.

The 32-bit target (one of the base PRs) is complete without this: a
plain EM_SPARC link runs, and is what a V8 toolchain produces. This
PR only widens what the linker accepts as input, so it ships
separately.


https://github.com/llvm/llvm-project/pull/228201