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runtime: do not zero blocks on free (this time for sure!)
R=iant CC=golang-dev https://golang.org/cl/207054
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@ -130,7 +130,6 @@ free(void *v)
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size = class_to_size[sizeclass];
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if(size > sizeof(uintptr))
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((uintptr*)v)[1] = 1; // mark as "needs to be zeroed"
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runtime_memclr(v, size);
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mstats.alloc -= size;
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mstats.by_size[sizeclass].nfree++;
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MCache_Free(c, v, sizeclass, size);
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