[libc] Fix memcpy to adhere to qualified calls.

Summary: Switched to using the new memcpy implementation.

Reviewers: sivachandra, abrachet, gchatelet

Reviewed By: abrachet, gchatelet

Subscribers: mgorny, MaskRay, tschuett, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D77277

Author: PaulkaToast

libc/fuzzing/string/CMakeLists.txt

@@ -5,4 +5,5 @@ add_libc_fuzzer(
   DEPENDS
     strcpy
     strlen
+    memcpy
 )

libc/src/string/CMakeLists.txt

@@ -21,6 +21,7 @@ add_entrypoint_object(
   DEPENDS
     string_h
     strlen
+    memcpy
 )
 
 add_entrypoint_object(

libc/src/string/strcpy.cpp

@@ -8,14 +8,15 @@
 
 #include "src/string/strcpy.h"
 #include "src/string/strlen.h"
+#include "src/string/memcpy.h"
 
 #include "src/__support/common.h"
 
 namespace __llvm_libc {
 
 char *LLVM_LIBC_ENTRYPOINT(strcpy)(char *dest, const char *src) {
   return reinterpret_cast<char *>(
-      ::memcpy(dest, src, __llvm_libc::strlen(src) + 1));
+      __llvm_libc::memcpy(dest, src, __llvm_libc::strlen(src) + 1));
 }
 
 } // namespace __llvm_libc

libc/test/src/string/CMakeLists.txt

@@ -12,6 +12,8 @@ add_libc_unittest(
     strcat
     strcpy
     strlen
+# TODO (sivachandra): remove redundant deps.
+    memcpy
 )
 
 add_libc_unittest(
@@ -23,6 +25,8 @@ add_libc_unittest(
   DEPENDS
     strcpy
     strlen
+# TODO (sivachandra): remove redundant deps.
+    memcpy
 )
 
 add_libc_unittest(