Fix __clear_cache declaration.

This fixes the build with gcc in gnu++98 and gnu++11 mode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181811 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Unix/Memory.inc

@@ -33,7 +33,7 @@
 #endif
 
 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
-extern "C" void __clear_cache(char *, char*);
+extern "C" void __clear_cache(void *, void*);
 
 namespace {