Update llvm.rs

Author: Dirreke

src/bootstrap/llvm.rs

@@ -374,28 +374,13 @@ impl Step for Llvm {
             cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
         }
 
-        if target.starts_with("riscv")
+        if (target.starts_with("riscv")
+            || target.starts_with("csky"))
             && !target.contains("freebsd")
             && !target.contains("openbsd")
             && !target.contains("netbsd")
         {
-            // RISC-V GCC erroneously requires linking against
-            // `libatomic` when using 1-byte and 2-byte C++
-            // atomics but the LLVM build system check cannot
-            // detect this. Therefore it is set manually here.
-            // Some BSD uses Clang as its system compiler and
-            // provides no libatomic in its base system so does
-            // not want this.
-            ldflags.exe.push(" -latomic");
-            ldflags.shared.push(" -latomic");
-        }
-
-        if target.starts_with("csky")
-            && !target.contains("freebsd")
-            && !target.contains("openbsd")
-            && !target.contains("netbsd")
-        {
-            // CSKY GCC erroneously requires linking against
+            // RISC-V and CSKY GCC erroneously requires linking against
             // `libatomic` when using 1-byte and 2-byte C++
             // atomics but the LLVM build system check cannot
             // detect this. Therefore it is set manually here.