LLVM-22 compatibility fixes.
Partially backports https://github.com/ROCm/llvm-project/commit/0216fcfc5d2a4f3384873f6e9ac70198760d5a52
--- a/src/comgr-compiler.cpp
+++ b/src/comgr-compiler.cpp
@@ -659,7 +659,7 @@ amd_comgr_status_t executeCommand(const Command &Job, raw_ostream &LogS,
 
     std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
     Clang->setVerboseOutputStream(LogS);
-    Clang->setFileManager(new FileManager(Clang->getFileSystemOpts(), &FS));
+    Clang->setVirtualFileSystem(&FS);
     if (!Argv.back()) {
       Argv.pop_back();
     }
@@ -909,8 +909,7 @@ amd_comgr_status_t AMDGPUCompiler::processFile(DataObject *Input,
   }
 
   // By default clang driver will ask CC1 to leak memory.
-  Argv.push_back("-Xclang");
-  Argv.push_back("-no-disable-free");
+  Argv.push_back("-disable-free=false");
 
   Argv.push_back(InputFilePath);