[mips]Reland^2 "[runtime] Move Context::native_context to the map"
Port 3cad6bf5 Original Commit Message: This is a reland of c7c47c68. This makes TSAN happy in addition to: Previously I presumed that the context read from a frame in the profiler was a valid context. Turns out that on non-intel we're not guaranteed that the frame is properly set up. In the case we looked at, the profiler took a sample right before writing the frame marker indicating a builtin frame, causing the "context" pointer from that frame to be a bytecode array. Since we'll read random garbage on the stack as a possible context pointer, I made the code reading the native context from it a little more defensive. Bug: v8:9860 Tbr: ulan@chromium.org, neis@chromium.org, ishell@chromium.org Original change's description: > [runtime] Move Context::native_context to the map > > Remove the native context slot from contexts by making context maps > native-context-specific. Now we require 2 loads to go from a context to the > native context, but we have 1 field fewer to store when creating contexts. > > Change-Id: I3c0d7c50c94060c4129db684f46a567de6f30e8d > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1859629 > Commit-Queue: Toon Verwaest <verwaest@chromium.org> > Reviewed-by: Igor Sheludko <ishell@chromium.org> > Reviewed-by: Peter Marshall <petermarshall@chromium.org> > Reviewed-by: Maya Lekova <mslekova@chromium.org> > Reviewed-by: Georg Neis <neis@chromium.org> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org> > Reviewed-by: Toon Verwaest <verwaest@chromium.org> > Cr-Commit-Position: refs/heads/master@{#64296} R=xwafish@gmail.com Change-Id: I6496a8c5be8cbabf48cddc2d59111410f31eb75f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1868774 Auto-Submit: Mu Tao <pamilty@gmail.com> Commit-Queue: Bill Budge <bbudge@chromium.org> Reviewed-by: Toon Verwaest <verwaest@chromium.org> Reviewed-by: Bill Budge <bbudge@chromium.org> Cr-Commit-Position: refs/heads/master@{#64486}
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