[MIPS GlobalISel] Remove switch statement (fix r349346 for MSVC)

Temporarily remove switch statement without any case labels 
in function legalizeCustom in order to fix r349346 for MSVC.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349356 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed