[libFuzzer] use sizeof() in tests instead of 4 and 8

llvm-svn: 281111
diff --git a/llvm/lib/Fuzzer/test/AbsNegAndConstantTest.cpp b/llvm/lib/Fuzzer/test/AbsNegAndConstantTest.cpp
index f2ade45..69075a4 100644
--- a/llvm/lib/Fuzzer/test/AbsNegAndConstantTest.cpp
+++ b/llvm/lib/Fuzzer/test/AbsNegAndConstantTest.cpp
@@ -12,8 +12,8 @@
   if (Size < 8) return 0;
   int x;
   unsigned y;
-  memcpy(&x, Data, 4);
-  memcpy(&y, Data + 4, 4);
+  memcpy(&x, Data, sizeof(x));
+  memcpy(&y, Data + sizeof(x), sizeof(y));
   if (abs(x) < 0 && y == 0xbaddcafe) {
     printf("BINGO; Found the target, exiting; x = 0x%x y 0x%x\n", x, y);
     exit(1);