Minor format/style changes to PPCSubtarget::isGVIndirectSymbol

- use dyn_cast instad of isa + cast
- remove erroneously added newline in otherwise untouched code.

Author: mandlebug

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

@@ -186,10 +186,10 @@ bool PPCSubtarget::enableSubRegLiveness() const {
 }
 
 bool PPCSubtarget::isGVIndirectSymbol(const GlobalValue *GV) const {
-  if (isAIXABI() && isa<GlobalVariable>(GV)) {
-    // On AIX the only symbols that aren't indirect are toc-data.
-    if (cast<GlobalVariable>(GV)->hasAttribute("toc-data"))
-      return false;
+  if (isAIXABI()) {
+    if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
+      // On AIX the only symbols that aren't indirect are toc-data.
+      return !GVar->hasAttribute("toc-data");
 
     return true;
   }