[llvm-exegesis] Disable core dumps in subprocess (#74144)

Core dumps are currently enabled within the llvm-exegesis subprocess
executor. This can create a lot of core dumps when going through
different snippets that might segfault when experimenting with memory
annotations. These core dumps are not really needed as the information
about the segfault is reported directly to the user.

llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp

@@ -34,6 +34,7 @@
 #endif
 #include <sys/mman.h>
 #include <sys/ptrace.h>
+#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/syscall.h>
 #include <sys/wait.h>
@@ -378,8 +379,21 @@ class SubProcessFunctionExecutorImpl
         Twine(strsignal(ChildSignalInfo.si_signo)));
   }
 
+  void disableCoreDumps() const {
+    struct rlimit rlim;
+
+    rlim.rlim_cur = 0;
+    setrlimit(RLIMIT_CORE, &rlim);
+  }
+
   [[noreturn]] void prepareAndRunBenchmark(int Pipe,
                                            const BenchmarkKey &Key) const {
+    // Disable core dumps in the child process as otherwise everytime we
+    // encounter an execution failure like a segmentation fault, we will create
+    // a core dump. We report the information directly rather than require the
+    // user inspect a core dump.
+    disableCoreDumps();
+
     // The following occurs within the benchmarking subprocess
     pid_t ParentPID = getppid();