[bolt] Fix a test affected by D131589.

This test contained some data tables that llvm-objdump was
disassembling as code, so the test was recovering the 32-bit values in
the table from the instruction encoding column of the disassembly.

D131589 changed how llvm-objdump decides what to disassemble as code
or as data. As a result, these data tables are now being disassembled
as data, which I think is actually more sensible -- but the test
wasn't expecting it, and got confused.

bolt/test/AArch64/r_aarch64_prelxx.s

@@ -17,7 +17,7 @@
 
 // CHECKPREL32: [[#%x,DATATABLEADDR:]] <datatable>:
 // CHECKPREL32-NEXT: 00:
-// CHECKPREL32-NEXT: 04: [[#%x,VALUE:]]
+// CHECKPREL32-NEXT: 04: {{.*}} .word 0x[[#%x,VALUE:]]
 
 // 4 is offset in datatable
 // 8 is addend
@@ -27,8 +27,8 @@
 // CHECKPREL64: [[#%x,DATATABLEADDR:]] <datatable>:
 // CHECKPREL64-NEXT: 00:
 // CHECKPREL64-NEXT: 04:
-// CHECKPREL64-NEXT: 08: [[#%x,VALUE:]]
-// CHECKPREL64-NEXT: 0c: 00000000
+// CHECKPREL64-NEXT: 08: {{.*}} .word 0x[[#%x,VALUE:]]
+// CHECKPREL64-NEXT: 0c: {{.*}} .word 0x00000000
 
 // 8 is offset in datatable
 // 12 is addend