Fix: name of tag in branch test source code

tb/test_source_code/tb_risc_v_cpu/branch_instruction.S

@@ -6,32 +6,32 @@
  */
 
 addi a0, zero, 0 # R[10]=0
-start:
-beq a0, zero, first
-addi a0, a0, 1 # R[10]=3
 first:
-bne a0, zero, second
-addi a0, a0, 2 # R[10]=2
-j start
+beq a0, zero, second
+addi a0, a0, 1 # R[10]=3
 second:
-addi a1, zero, 4 # R[11]=4
-blt a0, a1, third
-addi a0, a0, 3 # R[10]=10
+bne a0, zero, third
+addi a0, a0, 2 # R[10]=2
+j first
 third:
-addi a1, zero, 7 # R[11]=7
-ble a1, a0, forth
-add a0, a0, 4 # R[10]=7
-j second
+addi a1, zero, 4 # R[11]=4
+blt a0, a1, forth
+addi a0, a0, 3 # R[10]=10
 forth:
-addi a1, zero, 4294967295 # R[11]=4294967295, R[11]=-1
-bltu a0, a1, fifth
-addi a0, a0, 5
+addi a1, zero, 7 # R[11]=7
+ble a1, a0, fifth
+add a0, a0, 4 # R[10]=7
+j third
 fifth:
-addi a1, zero, 16 # R[11]=16
-bleu a1, a0, sixth
-add a0, a0, 6 # R[10]=16
-j forth
+addi a1, zero, 4294967295 # R[11]=4294967295, R[11]=-1
+bltu a0, a1, sixth
+addi a0, a0, 5
 sixth:
+addi a1, zero, 16 # R[11]=16
+bleu a1, a0, seventh
+add a0, a0, 6 # R[10]=16
+j fifth
+seventh:
 blt a0, a1, end
 addi a0, a0, 7 # R[10]=23
 end: