sanity test of mmap address top 16 bits being 0
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@ -69,6 +69,7 @@ static NOINLINE void* BN(allocateMore)(i64 bucket, u8 type, i64 from, i64 to) {
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#else
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u8* mem = MMAP(sz);
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if (mem==MAP_FAILED) thrOOM();
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if (ptr2u64(mem)+sz > (1ULL<<48)) err("mmap returned address range above 2⋆48");
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#if ALLOC_MODE==0
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// ux off = offsetof(TyArr,a);
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// if (off&31) mem+= 32-(off&31); // align heap such that arr->a is 32-byte-aligned
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