[PowerPC] Simplify evaluateAsRelocatableImpl

In addition, rename *MCExpr::getKind, which confusingly shadows the base class getKind.

Author: MaskRay

llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp

@@ -44,7 +44,7 @@ static PPCMCExpr::Specifier getAccessVariant(const MCValue &Target,
 
   if (Expr->getKind() != MCExpr::Target)
     return PPCMCExpr::Specifier(Target.getAccessVariant());
-  return cast<PPCMCExpr>(Expr)->getKind();
+  return cast<PPCMCExpr>(Expr)->getSpecifier();
 }
 
 unsigned PPCELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,

llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.cpp

@@ -85,8 +85,7 @@ bool PPCMCExpr::evaluateAsRelocatableImpl(MCValue &Res,
   if (Res.isAbsolute() && MaybeInt) {
     Res = MCValue::get(*MaybeInt);
   } else {
-    Res = MCValue::get(Res.getSymA(), Res.getSymB(), Res.getConstant(),
-                       getKind());
+    Res.setSpecifier(specifier);
   }
 
   return true;

llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCExpr.h

@@ -131,9 +131,7 @@ class PPCMCExpr : public MCTargetExpr {
   /// @name Accessors
   /// @{
 
-  Specifier getKind() const { return specifier; }
-
-  /// getSubExpr - Get the child of this expression.
+  Specifier getSpecifier() const { return specifier; }
   const MCExpr *getSubExpr() const { return Expr; }
 
   /// @}