Revert "Disable LeakSanitizer in TableGen binaries, see PR18325"

To declare or define reserved identifers is undefined behaviour in standard
C++. This needs to be addressed in compiler-rt before it can be used in LLVM.

See the list discussion for details.

This reverts commit r198858.

llvm-svn: 198885

clang/utils/TableGen/TableGen.cpp

@@ -263,10 +263,3 @@ int main(int argc, char **argv) {
 
   return TableGenMain(argv[0], &ClangTableGenMain);
 }
-
-extern "C" {
-// Disable LeakSanitizer for this binary as it has too many leaks that are not
-// very interesting to fix. __lsan_is_turned_off is explained in
-// compiler-rt/include/sanitizer/lsan_interface.h
-int __lsan_is_turned_off() { return 1; }
-}  // extern "C"