[gn build] Port 1a3b14d

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn

@@ -251,6 +251,8 @@ copy("Headers") {
     "raointintrin.h",
     "rdpruintrin.h",
     "rdseedintrin.h",
+    "riscv_bitmanip.h",
+    "riscv_crypto.h",
     "riscv_ntlh.h",
     "rtmintrin.h",
     "s390intrin.h",