trace: clang compatible handling of gd register
On ARM systems gd is stored in register r9 or x18. When compiling with clang gd is defined as a macro calling function gd_ptr(). So we can not make assignments to gd. Use function set_gd() for setting the register on ARM. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: NSimon Glass <sjg@chromium.org>
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