[WebAssembly] Don't pass -ffunction-section/-fdata-sections llvm currently forces both of these to true to passing them is redundant. Differential Revision: https://reviews.llvm.org/D37831 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@323897 91177308-0d34-0410-b5e6-96231b3b80d8