[U-Boot] arch/powerpc/config.mk: Pass -fno-ira-hoist-pressure when possible

[Tom Rini]

On Sat, Oct 17, 2015 at 08:13:54AM -0400, Tom Rini wrote:

> There are various toolchain issues that cause us to produce invalid
> binaries with certain gcc 4.8.x and 4.9.x versions when we don't pass
> this flag in.
> 
> Tested-by: Joakim Tjernlund <joakim.tjernlund at transmode.se>
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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