[flang] Expose -m32 and -m64 options

Author: JDPailleux

clang/include/clang/Driver/Options.td

@@ -4671,14 +4671,14 @@ def EB : Flag<["-"], "EB">, Alias<mbig_endian>;
 def m16 : Flag<["-"], "m16">, Group<m_Group>, Flags<[NoXarchOption]>,
   Visibility<[ClangOption, CLOption, DXCOption]>;
 def m32 : Flag<["-"], "m32">, Group<m_Group>, Flags<[NoXarchOption]>,
-  Visibility<[ClangOption, CLOption, DXCOption]>;
+  Visibility<[ClangOption, CLOption, DXCOption, FlangOption]>;
 def maix32 : Flag<["-"], "maix32">, Group<m_Group>, Flags<[NoXarchOption]>;
 def mqdsp6_compat : Flag<["-"], "mqdsp6-compat">, Group<m_Group>,
   Flags<[NoXarchOption]>, Visibility<[ClangOption, CC1Option]>,
   HelpText<"Enable hexagon-qdsp6 backward compatibility">,
   MarshallingInfoFlag<LangOpts<"HexagonQdsp6Compat">>;
 def m64 : Flag<["-"], "m64">, Group<m_Group>, Flags<[NoXarchOption]>,
-  Visibility<[ClangOption, CLOption, DXCOption]>;
+  Visibility<[ClangOption, CLOption, DXCOption, FlangOption]>;
 def maix64 : Flag<["-"], "maix64">, Group<m_Group>, Flags<[NoXarchOption]>;
 def mx32 : Flag<["-"], "mx32">, Group<m_Group>, Flags<[NoXarchOption]>,
   Visibility<[ClangOption, CLOption, DXCOption]>;

flang/test/Driver/driver-options.f90

@@ -0,0 +1,6 @@
+! Check support of -m32 and -m64.
+! RUN: %flang -target x86_64-pc-win32 -m32 -### - %s 2>&1 | FileCheck -check-prefix=M32 %s
+! RUN: %flang -target i386-pc-win32 -m64 -### - %s 2>&1 | FileCheck -check-prefix=M64 %s
+
+! M32: "-triple" "i{{[0-9]}}86-{{.*}}"
+! M64: "-triple" "{{[^-]+}}64-{{.*}}"