[CHERIoT] Restore pre-clang-21 behavior of using LLD as the default baremetal linker.

Author: resistor

clang/lib/Driver/ToolChains/BareMetal.h

@@ -56,6 +56,11 @@ class LLVM_LIBRARY_VISIBILITY BareMetal : public Generic_ELF {
     return UnwindTableLevel::None;
   }
 
+  // XXX CHERIOT: Restore pre-clang21 behavior of defaulting to lld.
+  const char *getDefaultLinker() const override {
+    return "ld.lld";
+  }
+
   CXXStdlibType GetDefaultCXXStdlibType() const override;
 
   RuntimeLibType GetDefaultRuntimeLibType() const override;