[ELF][Hexagon][test] Use llvm-readobj to check relocations. NFC

[merge_guards_bot]

Unit tests: pass. 61172 tests passed, 0 failed and 729 were skipped.

clang-tidy: pass.

clang-format: pass.

Build artifacts: diff.json, clang-tidy.txt, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

[sidneym]

This is fine with me. This patch doesn't remove the objdump checks are both necessary?

[MaskRay]

In D72093#1801658, @sidneym wrote:

This is fine with me. This patch doesn't remove the objdump checks are both necessary?

llvm-readobj -r checks input relocations. llvm-objdump -d checks output disassembly. Both are necessary.

I usually prefer llvm-readelf for other checks, like -S (section table), -s (symbol table) as its output is concise. For -r, the llvm-readobj output looks better.

lld/test/ELF/hexagon-tls-le.s

 # REQUIRES: hexagon
 # RUN: llvm-mc -filetype=obj -triple=hexagon-unknown-elf %s -o %t.o
+# RUN: llvm-readobj -r %t.o | FileCheck --check-prefix=RELOC %s
 # RUN: ld.lld %t.o -o %t
 # RUN: llvm-objdump -d --print-imm-hex %t | FileCheck %s
 
   .globl  _start
   .type _start, @function
 _start:
 r0 = ugp
 
-# R_HEX_TPREL_32_6_X and R_HEX_TPREL_16_X
+# RELOC:      0x4 R_HEX_TPREL_32_6_X a 0x0
+# RELOC-NEXT: 0x8 R_HEX_TPREL_16_X a 0x0
 # CHECK:      { immext(#0xffffffc0)
 # CHECK-NEXT:   r1 = add(r0,##-0x10) }
                 r1 = add(r0,##a@TPREL)
 
-# R_HEX_TPREL_32_6_X and R_HEX_TPREL_11_X
+# RELOC-NEXT: 0xC R_HEX_TPREL_32_6_X a 0x0
+# RELOC-NEXT: 0x10 R_HEX_TPREL_11_X a 0x0
 # CHECK:      { immext(#0xffffffc0)
 # CHECK-NEXT:   r2 = memw(r0+##-0x10) }
                 r2 = memw(r0+##a@TPREL)
 
+# RELOC-NEXT: 0x14 R_HEX_TPREL_HI16 a 0x0
 # R_HEX_TPREL_HI16
 # CHECK: {      r3.h = #0xffff }
                 r3.h = #a@TPREL
 
+# RELOC-NEXT: 0x18 R_HEX_TPREL_LO16 a 0x0
 # R_HEX_TPREL_LO16
 # CHECK: {      r3.l = #0xfff0 }
                 r3.l = #a@TPREL
 
-# R_HEX_TPREL_16
+# RELOC-NEXT: 0x1C R_HEX_TPREL_16 a 0x0
 # CHECK: {      r4 = #-0x10 }
                 r4 = #a@TPREL
 
         .section        .tdata,"awT",@progbits
         .globl  a
         .p2align        2
 a:
         .word   1