wasip2: Reimplement directory streams #642
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The main goal of this commit is to simplify what's located in the descriptor table of libc. Primarily directory streams are no longer located in the table and are instead stored directly in the `DIR*` structure. Additionally the wasip1-style `cookie` is removed in favor of a wasip2-specific offset counter. Along the way `__wasilibc_nocwd_scandirat` was rewritten for both wasip1 and wasip2 to be built on `openat` + `fdopendir`. This removes WASI-version-specific code and makes this look more similar to `scandir` elsewhere in libc.
alexcrichton
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The main goal of this commit is to simplify what's located in the descriptor table of libc. Primarily directory streams are no longer located in the table and are instead stored directly in the
DIR*structure. Additionally the wasip1-stylecookieis removed in favor of a wasip2-specific offset counter. Along the way__wasilibc_nocwd_scandiratwas rewritten for both wasip1 and wasip2 to be built onopenat+fdopendir. This removes WASI-version-specific code and makes this look more similar toscandirelsewhere in libc.