add blank line bw sections

Separate target features from rust ones with a blank line

Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: aszenz

src/rustllvm/PassWrapper.cpp

@@ -424,7 +424,7 @@ extern "C" void LLVMRustPrintTargetFeatures(LLVMTargetMachineRef TM) {
   printf("Available features for this target:\n");
   for (auto &Feature : FeatTable)
     printf("    %-*s - %s.\n", MaxFeatLen, Feature.Key, Feature.Desc);
-  printf("Rust-specific features:\n");
+  printf("\nRust-specific features:\n");
   printf("    %-*s - %s.\n",
     MaxFeatLen,
     "crt-static",