Reapply 56585:56589 with proper fix for some gcc versions

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56621 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 5be5c5d..08753e7 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -54,7 +54,7 @@
      case X86Subtarget::isWindows:
       return new X86WinTargetAsmInfo(*this);
      default:
-      return new X86TargetAsmInfo(*this);
+      return new X86GenericTargetAsmInfo(*this);
     }
 }