[CGData][ThinLTO] Global Outlining with Two-CodeGen Rounds (#90933) This feature is enabled by `-codegen-data-thinlto-two-rounds`, which effectively runs the `-codegen-data-generate` and `-codegen-data-use` in two rounds to enable global outlining with ThinLTO. 1. The first round: Run both optimization + codegen with a scratch output. Before running codegen, we serialize the optimized bitcode modules to a temporary path. 2. From the scratch object files, we merge them into the codegen data. 3. The second round: Read the optimized bitcode modules and start the codegen only this time. Using the codegen data, the machine outliner effectively performs the global outlining. Depends on #90934, #110461 and #110463. This is a patch for https://discourse.llvm.org/t/rfc-enhanced-machine-outliner-part-2-thinlto-nolto/78753.
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