[DirectX] Legalize lifetime intrinsics for DXIL (#148003) Fixes #147395 This PR legalizes lifetime intrinsics for DXIL by - Adding a bitcast for the lifetime intrinsics' pointer operand in dxil-prepare to ensure it gets cast to an `i8*` when written to DXIL - Removing the memory attribute from lifetime intrinsics in dxil-prepare to match DXIL - Making the DXIL bitcode writer write the base/demangled name of lifetime intrinsics to the symbol table - Making lifetime intrinsics an exception to Int64Ops shader flag analysis (otherwise we get `error: Flags must match usage.` from the validator)
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