ARC objdump has wrong register representation (rNrN+1 instead of rN only)

[kopartm]

ARC objdump (architecture: arc64:64) generates code with r2r3 register representation:
format elf64-littlearc64

 812:	1000 0682           	lddl	r2r3,[r0]
 816:	1c00 30a6           	stdl	r2r3,[sp,0]
 81a:	1000 0682           	lddl	r2r3,[r0]

It's not possible to use this code in an assembler directly due to the incorrect "rNrN+1" register format:
app.cc:32: error: unknown register name 'r2r3' in 'asm'
app.cc:32: error: unknown register name 'r0r1' in 'asm'

The assembler code is with one register only (r0 or r2 only).
This inconsistency should be fixed.