[lld] [lld][COFF]Expose UnifiedLTO and PassPipeline Options (PR #69904)

[Reid Kleckner via llvm-commits]

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@@ -126,8 +127,23 @@ BitcodeCompiler::BitcodeCompiler(COFFLinkerContext &c) : ctx(c) {
         llvm::heavyweight_hardware_concurrency(ctx.config.thinLTOJobs));
   }
 
+  lto::LTO::LTOKind Kind = lto::LTO::LTOK_Default;
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rnk wrote:

I think our first priority should probably be to remain in alignment with the other LLD ports, and they use lower case variables. We'd need input from the other LLD contributors, particularly @maskray. 

https://github.com/llvm/llvm-project/pull/69904