Same as stdexcept.cpp in libc++abi: we've already computed "len =
strlen(msg)", so we can use memcpy() instead of strcpy().

Index: src/stdexcept.cpp
===================================================================
--- src/stdexcept.cpp   (revision 183600)
+++ src/stdexcept.cpp   (working copy)
@@ -61,7 +61,7 @@ __libcpp_nmstr::__libcpp_nmstr(const char* msg)
     c[0] = c[1] = len;
     str_ += offset;
     count() = 0;
-    std::strcpy(const_cast<char*>(c_str()), msg);
+    std::memcpy(const_cast<char*>(c_str()), msg, len + 1);
 }
 
 inline
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