[Clang][MIPS] Send correct architecture for MinGW toolchains (#121042)

'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

@@ -138,6 +138,9 @@ 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();
   }

clang/test/Driver/mingw.cpp

@@ -85,6 +85,10 @@
 // RUN:   | FileCheck %s --check-prefix CHECK_MINGW_EC_LINK
 // CHECK_MINGW_EC_LINK: "-m" "arm64ecpe"
 
+// RUN: %clang --target=mipsel-windows-gnu -### -o /dev/null %s 2>&1 \
+// RUN:   | FileCheck %s --check-prefix CHECK_MINGW_MIPSPE
+// CHECK_MINGW_MIPSPE: "-m" "mipspe"
+
 // RUN: %clang --target=i686-windows-gnu -fms-hotpatch -### -- %s 2>&1 \
 // RUN:    | FileCheck %s --check-prefix=FUNCTIONPADMIN
 // FUNCTIONPADMIN: "--functionpadmin"