Replace a couple of uses of <assert.h> with <cassert>.

Author: rjmccall

include/swift/Remote/Failure.h

@@ -21,7 +21,7 @@
 #include "swift/Remote/RemoteAddress.h"
 
 #include "llvm/Support/Compiler.h"
-#include <assert.h>
+#include <cassert>
 #include <string>
 #include <cstring>
 #include <type_traits>

lib/IRGen/DominancePoint.h

@@ -23,8 +23,8 @@
 #ifndef SWIFT_IRGEN_DOMINANCEPOINT_H
 #define SWIFT_IRGEN_DOMINANCEPOINT_H
 
-#include <assert.h>
-#include <stdint.h>
+#include <cassert>
+#include <cstdint>
 
 namespace swift {
 namespace irgen {