Enable inline stack probes on riscv64

Fixes #1358

Author: bjorn3

src/lib.rs

@@ -280,14 +280,17 @@ fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Box<dyn isa::Tar
         }
     }
 
-    if let target_lexicon::Architecture::Aarch64(_) | target_lexicon::Architecture::X86_64 =
-        target_triple.architecture
+    if let target_lexicon::Architecture::Aarch64(_)
+    | target_lexicon::Architecture::Riscv64(_)
+    | target_lexicon::Architecture::X86_64 = target_triple.architecture
     {
-        // Windows depends on stack probes to grow the committed part of the stack
+        // Windows depends on stack probes to grow the committed part of the stack.
+        // On other platforms it helps prevents stack smashing.
         flags_builder.enable("enable_probestack").unwrap();
         flags_builder.set("probestack_strategy", "inline").unwrap();
     } else {
-        // __cranelift_probestack is not provided and inline stack probes are only supported on AArch64 and x86_64
+        // __cranelift_probestack is not provided and inline stack probes are only supported on
+        // AArch64, Riscv64 and x86_64.
         flags_builder.set("enable_probestack", "false").unwrap();
     }