Reland "[wasm] always allocate memory when guard regions are needed"
This reverts commit 7cf29d8d. Original change's description: > [wasm] always allocate memory when guard regions are needed > > When using trap handlers, memory references do not get any checks inserted. This > means there is no check for a null memory as happens when the memory size is > 0. Normally this would be correctly caught as an out of bounds access, since the > low memory addresses are not normally mapped. However, if they were mapped for > some reason, we would not catch the out of bounds access. > > The fix is to ensure WebAssembly instances always have a guard region even if > the memory is size 0. > > Bug: chromium:769637 Change-Id: I09fdaea92b7ccb3a6cc9e28392171ec098538a00 Reviewed-on: https://chromium-review.googlesource.com/695812 Commit-Queue: Eric Holk <eholk@chromium.org> Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#48293}
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