[WebAssembly] Add an -mdirect flag for the direct wasm object feature.

Add a target flag for enabling the new direct wasm object emission
feature.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@288447 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/Options.td

@@ -1613,6 +1613,8 @@ def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
 
 def msimd128 : Flag<["-"], "msimd128">, Group<m_wasm_Features_Group>;
 def mno_simd128 : Flag<["-"], "mno-simd128">, Group<m_wasm_Features_Group>;
+def mdirect : Flag<["-"], "mdirect">, Group<m_wasm_Features_Group>;
+def mno_direct : Flag<["-"], "mno-direct">, Group<m_wasm_Features_Group>;
 
 def mamdgpu_debugger_abi : Joined<["-"], "mamdgpu-debugger-abi=">,
   Flags<[HelpHidden]>,

lib/Basic/Targets.cpp

@@ -8019,6 +8019,10 @@ private:
         SIMDLevel = std::min(SIMDLevel, SIMDEnum(SIMD128 - 1));
         continue;
       }
+      if (Feature == "+direct")
+        continue;
+      if (Feature == "-direct")
+        continue;
 
       Diags.Report(diag::err_opt_not_valid_with_opt) << Feature
                                                      << "-target-feature";