Revert "[llvm-exegesis] Fix preservation of RDI in subprocess mode (llvm#72458)"

This reverts commit 0718c1a.

The test doesn't have the correct requires string apparently because it
attempts to run on all the buildbots. Reverting until I have time to fix
the test and reland it.

Author: boomanaiden154

llvm/test/tools/llvm-exegesis/X86/latency/subprocess-preserved-registers.s

@@ -1205,7 +1205,7 @@ ExegesisX86Target::configurePerfCounter(long Request, bool SaveRegisters) const
   if(SaveRegisters) {
     // Restore RAX, RDI, and RSI, in reverse order.
     generateRegisterStackPop(X86::RSI, ConfigurePerfCounterCode);
-    generateRegisterStackPop(X86::RDI, ConfigurePerfCounterCode);
+    generateRegisterStackPop(X86::RIP, ConfigurePerfCounterCode);
     generateRegisterStackPop(X86::RAX, ConfigurePerfCounterCode);
   }
   return ConfigurePerfCounterCode;