update to explicitly call subtarget func

Author: lei137

llvm/lib/Target/PowerPC/PPCSubtarget.h

@@ -191,7 +191,7 @@ class PPCSubtarget : public PPCGenSubtargetInfo {
   }
 
   unsigned  getRedZoneSize() const {
-    if (IsPPC64)
+    if (isPPC64())
       // 288 bytes = 18*8 (FPRs) + 18*8 (GPRs, GPR13 reserved)
       return 288;
 
@@ -216,8 +216,8 @@ class PPCSubtarget : public PPCGenSubtargetInfo {
   bool isSVR4ABI() const { return !isAIXABI(); }
   bool isELFv2ABI() const;
 
-  bool is64BitELFABI() const { return isSVR4ABI() && IsPPC64; }
-  bool is32BitELFABI() const { return isSVR4ABI() && !IsPPC64; }
+  bool is64BitELFABI() const { return isSVR4ABI() && isPPC64(); }
+  bool is32BitELFABI() const { return isSVR4ABI() && !isPPC64(); }
   bool isUsingPCRelativeCalls() const;
 
   /// Originally, this function return hasISEL(). Now we always enable it,
@@ -246,7 +246,7 @@ class PPCSubtarget : public PPCGenSubtargetInfo {
   /// True if the GV will be accessed via an indirect symbol.
   bool isGVIndirectSymbol(const GlobalValue *GV) const;
 
-  MVT getScalarIntVT() const { return IsPPC64 ? MVT::i64 : MVT::i32; }
+  MVT getScalarIntVT() const { return isPPC64() ? MVT::i64 : MVT::i32; }
 
   /// Calculates the effective code model for argument GV.
   CodeModel::Model getCodeModel(const TargetMachine &TM,