[SVE][NFC] Remove unused variable

[tbosch]

Summary

Remove unused variable.

llvm/unittests/IR/VectorTypesTest.cpp

for (size_t I = 0, IEnd = VTys.size(); I < IEnd; ++I) {
     // test I == J
     VectorType *VI = VTys[I];
     ElementCount ECI = VI->getElementCount();
     EXPECT_EQ(isa<ScalableVectorType>(VI), ECI.Scalable);
 
     for (size_t J = I + 1, JEnd = VTys.size(); J < JEnd; ++J) {
       // test I < J
       VectorType *VJ = VTys[J];
-      ElementCount ECJ = VJ->getElementCount();
       EXPECT_VTY_NE(VI, VJ);
 
       VectorType *VJPrime = VectorType::get(VI->getElementType(), VJ);
       if (VI->getElementType() == VJ->getElementType()) {
         EXPECT_VTY_EQ(VJ, VJPrime);
       } else {
         EXPECT_VTY_NE(VJ, VJPrime);
       }