* config/tc-arm.c, config/tc-arm.h (tc_arm_regname_to_dw2regnum):

	* config/tc-arm.c, config/tc-arm.h (tc_arm_regname_to_dw2regnum):
	Un-constify string argument.
	* config/tc-i386.c, config/tc-i386.h (tc_x86_regname_to_dw2regnum):
	Likewise.
	* config/tc-m68k.c, config/tc-m68k.h (tc_m68k_regname_to_dw2regnum):
	Likewise.
	* config/tc-ppc.c, config/tc-ppc.h (tc_ppc_regname_to_dw2regnum):
	Likewise.
	* config/tc-s390.c, config/tc-s390.h (tc_s390_regname_to_dw2regnum):
	Likewise.
	* config/tc-sh.c, config/tc-sh.h (sh_regname_to_dw2regnum):
	Likewise.
	* config/tc-sparc.c, config/tc-sparc.h (sparc_regname_to_dw2regnum):
	Likewise.
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