[mips] Move test to correct directory. NFCI

llvm-svn: 316081

diff --git a/llvm/test/CodeGen/Mips/constMaterialization.ll b/llvm/test/CodeGen/Mips/cstmaterialization/constMaterialization.ll
similarity index 100%
rename from llvm/test/CodeGen/Mips/constMaterialization.ll
rename to llvm/test/CodeGen/Mips/cstmaterialization/constMaterialization.ll