feat(C++ modules) Improve incremental build clang #6788
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…e to compile objectfile instead of module sourcefile
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…to enable bmi hash comparison as incremental build optimisation for clang
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this PR add the support of reduced bmi for clang, and introduce a policy to e,able an experimental feature which check hash of bmi files and avoid to rebuild dependant bmi if the hash doesn't change (which mean the interface is unchanged, see https://releases.llvm.org/19.1.0/tools/clang/docs/StandardCPlusPlusModules.html#experimental-non-cascading-changes)