Remove a bunch of unused variable assignments.

Found by the clang static analyzer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148541 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index df7dbe0..f6bf073 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -1914,12 +1914,11 @@
     for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e;
          ++ArgNo) {
       EVT ObjectVT = Ins[ArgNo].VT;
-      unsigned ObjSize = ObjectVT.getSizeInBits()/8;
       ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
 
       if (Flags.isByVal()) {
         // ObjSize is the true size, ArgSize rounded up to multiple of regs.
-        ObjSize = Flags.getByValSize();
+        unsigned ObjSize = Flags.getByValSize();
         unsigned ArgSize =
                 ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
         VecArgOffset += ArgSize;