refactor(allocator): fixed size allocator leave space for metadata after arena#12278
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…ter arena (#12278) `FixedSizeAllocator` create an inner `Allocator` 16 bytes smaller than the buffer size. The last 16 bytes will be used to store `RawTransferMetadata` (offset of the AST data etc). This prepares `FixedSizeAllocator` for use with raw transfer for JS linter plugins.
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FixedSizeAllocatorcreate an innerAllocator16 bytes smaller than the buffer size. The last 16 bytes will be used to storeRawTransferMetadata(offset of the AST data etc). This preparesFixedSizeAllocatorfor use with raw transfer for JS linter plugins.