target/arm: Make switch_mode() file-local
The switch_mode() function is defined in target/arm/helper.c and used only in that file and nowhere else, so we can make it file-local rather than global. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-id: 20181012144235.19646-3-peter.maydell@linaro.org
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