Fix writing COFF files when cross-compiling on OSX

[Berkus]

Do you want it to be a stand-alone test case for testing suite or just an example that illustrates the problem?

On 04 Sep 2014, at 21:47, Rafael Espíndola <rafael.espindola at gmail.com> wrote:

> Can you add a testcase to the patch?
> 
> On 28 May 2014 11:34, Stanislav Karchebny <berkus at madfire.net> wrote:
>> The issue: Trying to build an EFI application with clang on OSX host.
>> 
>> Specifying -target i386-pe—coff resulted in abort from MCWinCOFFStreamer:
>> 
>> fatal error in backend: alignment is limited to 32-bytes
>> 
>> Turns out, that while the streamer was created for coff, the asm backend and asminfo were created for ELF output.
>> The attached patch fixes it by creating appropriate objects when COFF output is requested.
>> 
>> After applying the patch I was able to successfully build and run my EFI application using only clang/lld (no GNU or MSVC tools involved).
>> 
>> 
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