Provide SSSE3, AVX2, and AVX512 optimized Reed-Solomon functions (#2828)

* Provide SSSE3, AVX2, and AVX512 optimized Reed-Solomon functions

* Update nanors to fix AVX-512 memory corruption

tests/unit/test_rswrapper.cpp

@@ -0,0 +1,37 @@
+/**
+ * @file tests/unit/test_rswrapper.cpp
+ * @brief Test src/rswrapper.*
+ */
+
+extern "C" {
+#include <src/rswrapper.h>
+}
+
+#include <tests/conftest.cpp>
+
+TEST(ReedSolomonWrapperTests, InitTest) {
+  reed_solomon_init();
+
+  // Ensure all function pointers were populated
+  ASSERT_NE(reed_solomon_new, nullptr);
+  ASSERT_NE(reed_solomon_release, nullptr);
+  ASSERT_NE(reed_solomon_encode, nullptr);
+  ASSERT_NE(reed_solomon_decode, nullptr);
+}
+
+TEST(ReedSolomonWrapperTests, EncodeTest) {
+  reed_solomon_init();
+
+  auto rs = reed_solomon_new(1, 1);
+  ASSERT_NE(rs, nullptr);
+
+  uint8_t dataShard[16] = {};
+  uint8_t fecShard[16] = {};
+
+  // If we picked the incorrect ISA in our wrapper, we should crash here
+  uint8_t *shardPtrs[2] = { dataShard, fecShard };
+  auto ret = reed_solomon_encode(rs, shardPtrs, 2, sizeof(dataShard));
+  ASSERT_EQ(ret, 0);
+
+  reed_solomon_release(rs);
+}