[libc] [llvm] Reland Refactor WIDE_READ to allow finer control over high-performance function selection (#165613) (PR #170738)

[via llvm-commits]

================
@@ -1,7 +1,10 @@
 {
   "string": {
-    "LIBC_CONF_STRING_UNSAFE_WIDE_READ": {
-      "value": false
+    "LIBC_CONF_STRING_LENGTH_IMPL": {
+      "value": "element"
+    }
----------------
Sterling-Augustine wrote:

Can be fixed with https://github.com/llvm/llvm-project/pull/170776

https://github.com/llvm/llvm-project/pull/170738