[lld] [lld] Support thumb PLTs (PR #86223)

[Peter Smith via llvm-commits]

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@@ -337,7 +433,7 @@ bool ARM::needsThunk(RelExpr expr, RelType type, const InputFile *file,
   case R_ARM_THM_JUMP24:
     // Source is Thumb, all PLT entries are ARM so interworking is required.
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smithp35 wrote:

Could change to `Source is Thumb, when all PLT entries are ARM interworking is required.

https://github.com/llvm/llvm-project/pull/86223