optimize memset and memclr for ARM#164

Merged

bors merged 2 commits intomasterfrom

Jul 1, 2017

Commits on Jun 30, 2017

optimize 32-bit aligned mem{cpy,clr,set} intrinsics for ARM
japaric
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no aeabi_mem* symbols on iOS, weak symbols on thumb, normal symbols elsewhere
japaric
committed