[DirectX] Fix IO sandbox violation in DXContainerPDB pass (#204461) `DXContainerPDB::runOnModule` writes a PDB file to disk via `PDBFileBuilder::commit`, which calls through `MSFBuilder::commit` -> `FileOutputBuffer::create` -> `llvm::sys::fs::status()`. These are raw filesystem APIs that trigger a fatal "IO sandbox violation" when the IO sandbox is enabled. The sandbox is enabled in `CC1Command::Execute` (Job.cpp) to enforce that all filesystem access goes through the VFS. Since `PDBFileBuilder` doesn't support VFS-based output, bypass the sandbox for the commit call using `scopedDisable()`, matching the established pattern used in `raw_ostream.cpp`, `VirtualFileSystem.cpp`, `BackendUtil.cpp`, and others. This crash occurs on any clang invocation targeting the DirectX backend with PDB emission enabled, e.g.: `Target: dxilv1.7-unknown-shadermodel6.7-library` and was introduced with this commit: https://github.com/llvm/llvm-project/pull/202762, which added the `Builder.commit(DebugFileName, ...)` call that writes a PDB file via raw filesystem APIs, which violates the IO sandbox. Stack trace: ``` reportFatalInternalError("IO sandbox violation") llvm::sys::fs::status() FileOutputBuffer::create() MSFBuilder::commit() PDBFileBuilder::commit() DXContainerPDB::runOnModule() ``` Assisted by: Github Copilot Fixes: https://github.com/llvm/llvm-project/issues/204468
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