Unbreak build: 'DarwinTargetAsmInfo' was already taken as PPC TAI flavour.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53801 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCTargetAsmInfo.h b/lib/Target/PowerPC/PPCTargetAsmInfo.h
index 4884628..cca7bdb 100644
--- a/lib/Target/PowerPC/PPCTargetAsmInfo.h
+++ b/lib/Target/PowerPC/PPCTargetAsmInfo.h
@@ -25,14 +25,14 @@
     explicit PPCTargetAsmInfo(const PPCTargetMachine &TM);
   };
 
-  struct DarwinTargetAsmInfo : public PPCTargetAsmInfo {
-    explicit DarwinTargetAsmInfo(const PPCTargetMachine &TM);
+  struct PPCDarwinTargetAsmInfo : public PPCTargetAsmInfo {
+    explicit PPCDarwinTargetAsmInfo(const PPCTargetMachine &TM);
     virtual unsigned PreferredEHDataFormat(DwarfEncoding::Target Reason,
                                            bool Global) const;
   };
 
-  struct LinuxTargetAsmInfo : public PPCTargetAsmInfo {
-    explicit LinuxTargetAsmInfo(const PPCTargetMachine &TM);
+  struct PPCLinuxTargetAsmInfo : public PPCTargetAsmInfo {
+    explicit PPCLinuxTargetAsmInfo(const PPCTargetMachine &TM);
     virtual unsigned PreferredEHDataFormat(DwarfEncoding::Target Reason,
                                            bool Global) const;
   };