wasm: bump dyld v8 heap size limit
This patch adds `--max-old-space-size=8192` to wasm dyld shebang arguments to bump V8 heap size limit. The default limit (`heap_size_limit` returned by `v8.getHeapStatistics()`) is dynamically determined and a bit too low under certain workloads, and V8 would waste too much CPU time to garbage collect old generation heap more aggressively. Bumping the limit to 8G doesn't imply dyld would really take that much memory at run-time, but it lessens V8 heap stress significantly. (cherry picked from commit 14c5143899d164c7ac1213d918b4819684538c4b)
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