[llvm] [libc] [libc] Adding a version of memset with software prefetching (PR #70857)

[via llvm-commits]

================
@@ -21,6 +21,10 @@
     "LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
       "value": false,
       "doc": "Read more than a byte at a time to perform byte-string operations like strlen."
+    },
+    "LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING": {
+      "value": false,
+      "doc": "Use software prefetching in memset to increase performance."
----------------
doshimili wrote:

Got it, thank you. Updated it now

https://github.com/llvm/llvm-project/pull/70857