v5: simplify: move JBSMATCH_OPCODE block outside nested switch

Before:
   text	   data	    bss	    dec	    hex	filename
   3884	      0	      0	   3884	    f2c	apf_interpreter.arm.o
   text	   data	    bss	    dec	    hex	filename
   4822	      0	      0	   4822	   12d6	apf_interpreter.x86.o
After:
   text	   data	    bss	    dec	    hex	filename
   3912	      0	      0	   3912	    f48	apf_interpreter.arm.o
   text	   data	    bss	    dec	    hex	filename
   4829	      0	      0	   4829	   12dd	apf_interpreter.x86.o

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ib1901d09182297e6feeadb83f01dbe0be17b636d
2 files changed