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

[Sander de Smalen via llvm-commits]

================
@@ -35,10 +35,12 @@ asm(\".arch armv8-a+lse\");
 asm(\"cas w0, w1, [x2]\");
 ")
 
-builtin_check_c_compiler_source(COMPILER_RT_HAS_ASM_SME
+builtin_check_c_compiler_source(COMPILER_RT_HAS_AARCH64_SME
 "
-asm(\".arch armv9-a+sme\");
-asm(\"smstart\");
+void foo(int a)  __arm_streaming_compatible {
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sdesmalen-arm wrote:

nit:
```suggestion
void foo(void)  __arm_streaming_compatible {
```

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