[compiler-rt] [AArch64][compiler-rt] Add memcpy, memset, memmove, memchr simple imp… (PR #77496)

[Sander de Smalen via llvm-commits]

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@@ -0,0 +1,140 @@
+// REQUIRES: aarch64-target-arch, aarch64-sme-available
+// RUN: %clangxx_builtins %s %librt -o %t && %run %t
+
+#include <cassert>
+#include <initializer_list>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern "C" {
+void *__arm_sc_memcpy(void *, const void *, size_t);
+void *__arm_sc_memset(void *, int, size_t);
+void *__arm_sc_memmove(void *, const void *, size_t);
+void *__arm_sc_memchr(const void *, int, size_t);
+}
+
+template <unsigned N> class Memory {
+public:
+  uint8_t ptr[N];
+
+  Memory(int Stride = 0) {
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sdesmalen-arm wrote:

nit:
```suggestion
  Memory(unsigned Stride = 0) {
```

https://github.com/llvm/llvm-project/pull/77496