r225802 - Handle [extern_c] attribute in module printer

[Ben Langmuir]

The test in my next commit (r225803) should cover this.

> On Jan 13, 2015, at 1:21 PM, Sean Silva <chisophugis at gmail.com> wrote:
> 
> Is this testable?
> 
> On Tue, Jan 13, 2015 at 9:47 AM, Ben Langmuir <blangmuir at apple.com <mailto:blangmuir at apple.com>> wrote:
> Author: benlangmuir
> Date: Tue Jan 13 11:47:38 2015
> New Revision: 225802
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=225802&view=rev <http://llvm.org/viewvc/llvm-project?rev=225802&view=rev>
> Log:
> Handle [extern_c] attribute in module printer
> 
> I'm not sure why we have OS.indent(Indent+2) for the system attribute,
> but presumably we want the same behaviour for all attributes...
> 
> Modified:
>     cfe/trunk/lib/Basic/Module.cpp
> 
> Modified: cfe/trunk/lib/Basic/Module.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Module.cpp?rev=225802&r1=225801&r2=225802&view=diff <http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Module.cpp?rev=225802&r1=225801&r2=225802&view=diff>
> ==============================================================================
> --- cfe/trunk/lib/Basic/Module.cpp (original)
> +++ cfe/trunk/lib/Basic/Module.cpp Tue Jan 13 11:47:38 2015
> @@ -293,9 +293,12 @@ void Module::print(raw_ostream &OS, unsi
>      OS << "explicit ";
>    OS << "module " << Name;
> 
> -  if (IsSystem) {
> +  if (IsSystem || IsExternC) {
>      OS.indent(Indent + 2);
> -    OS << " [system]";
> +    if (IsSystem)
> +      OS << " [system]";
> +    if (IsExternC)
> +      OS << " [extern_c]";
>    }
> 
>    OS << " {\n";
> 
> 
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