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8037bbe327
Fix non-exported `setFileSize` to take optional `oldSize` to (on posix) shrink differently than it grows (`ftruncate` not `posix_fallocate`) since it makes sense to assume the higher address space has already been allocated there and include the old file size in the `proc resize` call. Also, do not even try `setFileSize` in the first place unless the `open` itself works by moving the call into the `if newFileSize != -1` branch. Just cosmetics, also improve some old 2011 comments, note a logic diff for callers using both `mappedSize` & `newFileSize` from windows branch in case someone wants to fix that & simplify code formatting a little.