Remove memcpy test workaround for name mangling substitutions.

crosstest/mem_intrin_main.cpp

 /* crosstest.py --test=mem_intrin.cpp --driver=mem_intrin_main.cpp \
    --prefix=Subzero_ --output=mem_intrin */
 
 #include <stdint.h> /* cstdint requires -std=c++0x or higher */
 #include <cstdio>
 
 #include "mem_intrin.h"
 namespace Subzero_ {
 #include "mem_intrin.h"
 }
@@ skipping 22 matching lines @@
 #undef do_test_fixed
 }
 
 void testVariableLen(size_t &TotalTests, size_t &Passes, size_t &Failures) {
   uint8_t buf[256];
   uint8_t buf2[256];
 #define do_test_variable(test_func)                                     \
   for (size_t len = 4; len < 128; ++len) {                              \
     for (uint8_t init_val = 0; init_val < 100; ++init_val) {            \
       ++TotalTests;                                                     \
-      int llc_result = test_func(buf, (void *)buf2, init_val, len);     \
-      int sz_result = Subzero_::test_func(buf, (void *)buf2, init_val, len); \
+      int llc_result = test_func(buf, buf2, init_val, len);             \
+      int sz_result = Subzero_::test_func(buf, buf2, init_val, len);    \
       if (llc_result == sz_result) {                                    \
         ++Passes;                                                       \
       } else {                                                          \
         ++Failures;                                                     \
         printf("Failure (%s): init_val=%d, len=%d, llc=%d, sz=%d\n",    \
                STR(test_func), init_val, len, llc_result, sz_result);   \
       }                                                                 \
     }                                                                   \
   }
 
   do_test_variable(memcpy_test)
   do_test_variable(memmove_test)
   do_test_variable(memset_test)
 #undef do_test_variable
 }
 
 int main(int argc, char **argv) {
   unsigned TotalTests = 0;
   unsigned Passes = 0;
   unsigned Failures = 0;
   testFixedLen(TotalTests, Passes, Failures);
   testVariableLen(TotalTests, Passes, Failures);
   printf("TotalTests=%u Passes=%u Failures=%u\n", TotalTests, Passes, Failures);
   return Failures;
 }