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This replaces all uses of
__tempMemory__, the old scratch space location, with calls to function imports for scratch memory access. This lets us then implement those in a way that does not use the same heap as main memory. This avoids possible bugs with scratch memory overwriting something, or just in general that it has observable side effects, which can confuse fuzzing etc.The intrinsics are currently implemented in the glue. We could perhaps emit them inline instead (but that might limit asm.js optimizations, so I wanted to keep our options open for now - easy to change later).
Also fixes some places where we used 0 as the scratch space address.