cmd/link: set high bit of PC on Wasm On Wasm, functions are not stored in the linear memory. Currently, we represent the "PC" as function index << 16 + block index. A PC can (accidentally) look like a data pointer, which may confuse the GC. This CL sets the highest bit of the PC, so PCs are distinct from data pointers (the linear memory is at most 4 GiB). Change-Id: I234e9ee7a4fdd88eefd7028c528b724a811e7902 Reviewed-on: https://go-review.googlesource.com/c/go/+/805061 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
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