GCC toolchain (<= 4.8) doesn't enable optimizations for X64 RELEASE builds about edk2 HOT 6 CLOSED

I used -Os in tools_def.txt before, but gcc fails to build because -Os has some conflicts with (ms_abi), so there's no -Os for gcc.

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I'm using -Os successfully with gcc 4.9 at least.

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gcc-4.8 accepts -Os if -maccumulate-outgoing-args is specified in addition, but unfortunately it also misbuilds edk2 that way. Sergey Isakov reported however that gcc-4.9 worked for him, so that seems consistent with @bcran's comment #34 (comment). See this thread:

http://thread.gmane.org/gmane.comp.bios.tianocore.devel/10963

This is quite unfortunate (for gcc-4.8), because -Os brings significant space savings.

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@bcran since this appears to apply to edk2 master as well, I propose to remove the UDK reference from the title. Thanks.

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@lersek I added the UDK reference to indicate that it wasn't a new bug - because it might be nice to have fixes committed to other branches such as UDK2014.SP1 and UDK2015 in addition to master.

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@bcran point taken, setting tags.

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