[Clang][MIPS] Send correct architecture for MinGW toolchains

'mipspe' name was chosen by binutils, when the project was able to create
executables for Windows CE/MIPS.

Author: hpoussin

clang/lib/Driver/ToolChains/MinGW.cpp

@@ -137,6 +137,9 @@ void tools::MinGW::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     else
       CmdArgs.push_back("arm64pe");
     break;
+  case llvm::Triple::mipsel:
+    CmdArgs.push_back("mipspe");
+    break;
   default:
     D.Diag(diag::err_target_unknown_triple) << TC.getEffectiveTriple().str();
   }