[clang] [clang][modules] Virtualize module cache pruning (PR #149113)

llvmbot wrote: @llvm/pr-subscribers-clang-modules Author: Jan Svoboda (jansvoboda11) Changes This PR virtualizes module cache pruning via the new `ModuleCache` interface. Currently this is an NFC, but I left a FIXME in `InProcessModuleCache` to make this more efficient for the dependency

[clang] [clang][modules] Virtualize module cache pruning (PR #149113)

https://github.com/jansvoboda11 created https://github.com/llvm/llvm-project/pull/149113 This PR virtualizes module cache pruning via the new `ModuleCache` interface. Currently this is an NFC, but I left a FIXME in `InProcessModuleCache` to make this more efficient for the dependency scanner.