This patch adds support for reading halfword values from memory. This command compliments existing support for writing halfwords (mwh). Change-Id: I8ec628e65c05a7f00aa57e3af0f228eb8bd4d14e Signed-off-by: Steven Stallion <stallion@squareup.com> Reviewed-on: http://openocd.zylin.com/4781 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>master