[SR-6361] Fix Data.withUnsafeMutableBytes() for slices with length < range.lowerBound #12898
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Update to overlay to match changes done to Data.swift that are approved in PR to swift-corelibs-foundation requested by @phausler:
swiftlang/swift-corelibs-foundation#1314
This PR will fix
fatal error: UnsafeMutableRawBufferPointer with negative count
when usingData.withUnsafeMutableBytes()
for slices with length < range.lowerBoundResolves SR-6361.
Thank you!