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[NFC] Add -enable-sil-opaque-values frontend option. This will be used to change the SIL-level calling convention for opaque values, such as generics and resilient structs, to pass-by-value. Under this flag, opaque values have SSA lifetimes, managed by copy_value and destroy_value. This will make it easier to optimize copies and verify ownership. * [SILGen] type lowering support for opaque values. Add OpaqueValueTypeLowering. Under EnableSILOpaqueValues, lower address-only types as opaque values. * [SIL] Fix ValueOwnershipKind to support opaque SIL values. * Test case: SILGen opaque value support for Parameter/ResultConvention. * [SILGen] opaque value support for function arguments. * Future Test case: SILGen opaque value specialDest arguments. * Future Test case: SILGen opaque values: emitOpenExistential. * Test case: SIL parsing support for EnableSILOpaqueValues. * SILGen opaque values: prepareArchetypeCallee. * [SIL Verify] allow copy_value for EnableSILOpaqueValues. * Test cast: SIL serializer support for opaque values. * Add a static_assert for ParameterConvention layout. * Test case: Mandatory SILOpt support for EnableSILOpaqueValues. * Test case: SILOpt support for EnableSILOpaqueValues. * SILGen opaque values: TypeLowering emitCopyValue. * SILBuilder createLoad. Allow loading opaque values. * SIL Verifier. Allow loading and storing opaque values. * SILGen emitSemanticStore support for opaque values. * Test case for SILGen emitSemanticStore. * Test case for SIL mandatory support for inout assignment. * Fix SILGen opaque values test case after rebasing.