Auto merge of #44440 - cuviper:min_global_align, r=japaric

Add `TargetOptions::min_global_align`, with s390x at 16-bit

The SystemZ `LALR` instruction provides PC-relative addressing for globals,
but only to *even* addresses, so other compilers make sure that such
globals are always 2-byte aligned.  In Clang, this is modeled with
`TargetInfo::MinGlobalAlign`, and `TargetOptions::min_global_align` now
serves the same purpose for rustc.

In Clang, the only targets that set this are SystemZ, Lanai, and NVPTX, and
the latter two don't have targets in rust master.

Fixes #44411.
r? @eddyb

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