[lld] [lld] Add target support for SystemZ (s390x) (PR #75643)

[Fangrui Song via llvm-commits]

================
@@ -0,0 +1,72 @@
+// REQUIRES: systemz
+// RUN: llvm-mc -filetype=obj -triple=s390x-none-linux-gnu %s -o %t.o
+// RUN: ld.lld -static %t.o -o %tout
+// RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %tout | FileCheck %s --check-prefix=DISASM
+// RUN: llvm-readelf --section-headers --relocations --symbols %tout | FileCheck %s
+
+// CHECK:      There are 9 section headers
+// CHECK:      Section Headers:
+// CHECK-NEXT:  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
+// CHECK-NEXT:  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
+// CHECK-NEXT:  [ 1] .rela.dyn         RELA            0000000001000158 000158 000030 18  AI  0   4  8
+// CHECK-NEXT:  [ 2] .text             PROGBITS        0000000001001188 000188 00001c 00  AX  0   0  4
+// CHECK-NEXT:  [ 3] .iplt             PROGBITS        00000000010011b0 0001b0 000040 00  AX  0   0 16
+// CHECK-NEXT:  [ 4] .got.plt          PROGBITS        00000000010021f0 0001f0 000010 00  WA  0   0  8
+// CHECK-NEXT:  [ 5] .comment          PROGBITS        0000000000000000 000200 000008 01  MS  0   0  1
----------------
MaskRay wrote:

sections starting from `.comment` can be removed to simplify possible layout change in the future.

https://github.com/llvm/llvm-project/pull/75643