[gn build] Port f2c50f9

Author: llvmgnsyncbot

llvm/utils/gn/secondary/bolt/lib/Rewrite/BUILD.gn

@@ -34,6 +34,7 @@ static_library("Rewrite") {
     "MachORewriteInstance.cpp",
     "MetadataManager.cpp",
     "PseudoProbeRewriter.cpp",
+    "RSeqRewriter.cpp",
     "RewriteInstance.cpp",
     "SDTRewriter.cpp",
   ]