[PowerPC][AIX] Fix printing of program counter for AIX assembly.

    return printOperand(MI, OpNo, O);

  // Branches can take an immediate operand. This is used by the branch

  // selection pass to print .+8, an eight byte displacement from the PC.

  // selection pass to print, for example `.+8` (for ELF) or `$+8` (for AIX) to

  // express an eight byte displacement from the program counter.

  if (!TT.isOSAIX())

    O << ".";

  else

    O << "$";

  int32_t Imm = SignExtend32<32>((unsigned)MI->getOperand(OpNo).getImm() << 2);

  if (Imm >= 0)

    O << "+";

# RUN: llc -x mir -mtriple powerpc-unknown-aix-xcoff --verify-machineinstrs \

# RUN: -start-before=ppc-branch-select < %s | FileCheck %s

#

# RUN: llc -x mir -mtriple powerpc64-unknown-aix-xcoff --verify-machineinstrs \

# RUN: -start-before=ppc-branch-select < %s | FileCheck %s

# Test uses a long branch to force printing of a branch that uses the program

# counter as an operand. ($PC + 8)

---

name:            print_program_counter

machineFunctionInfo: {}

body:             |

  bb.0.entry:

    successors: %bb.1(0x30000000), %bb.2(0x50000000)

    liveins: $r3

    renamable $cr0 = CMPLWI killed renamable $r3, 0

    BCC 76, killed renamable $cr0, %bb.1

  bb.2:

    renamable $r3 = LI 2

    INLINEASM &".space 32760", 1

    BLR implicit $lr, implicit $rm, implicit killed $r3

  bb.1:

    renamable $r3 = LI 1

    INLINEASM &".space 32760", 1

    BLR implicit $lr, implicit $rm, implicit killed $r3

# CHECK-LABEL: .print_program_counter:

# CHECK:         cmplwi

# CHECK-NEXT:    bne    {{[0-9]}}, $+8