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Brad King authored
According to ARMCC 5.06 documentation: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0472m/chr1359125007083.html the compiler may define `__GNUC__` in addition to `__ARMCC_VERSION`. Re-order our preprocessor checks to consider the ARM-specific macro first so that the ARM compiler is not mistaken for a GNU compiler. Fixes: #19065
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