[llvm-objdump][AArch64] Fix ADRP target label calculation

This patch makes ADRP target label address calculations the same as
label address calculations (see AArch64InstPrinter::printAdrpLabel()).

Otherwise the target label looks misleading as ADRP's immediate offset is,
actually, not an offset to this PC, but an offset to the current PC's
page address in pages.

See for example, `llvm-objdump/ELF/AArch64/pcrel-address.yaml`.
Before this patch the target label `<_start+0x80>` represents the
address `0x200100 + 0x80` while `0x220000` is expected.

Note that with this patch llvm-objdump output matches GNU objdump.

Reviewed By: simon_tatham

Differential Revision: https://reviews.llvm.org/D139407

llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCTargetDesc.cpp

@@ -412,8 +412,11 @@ class AArch64MCInstrAnalysis : public MCInstrAnalysis {
     const auto &Desc = Info->get(Inst.getOpcode());
     for (unsigned i = 0, e = Inst.getNumOperands(); i != e; i++) {
       if (Desc.OpInfo[i].OperandType == MCOI::OPERAND_PCREL) {
-        int64_t Imm = Inst.getOperand(i).getImm() * 4;
-        Target = Addr + Imm;
+        int64_t Imm = Inst.getOperand(i).getImm();
+        if (Inst.getOpcode() == AArch64::ADRP)
+          Target = (Addr & -4096) + Imm * 4096;
+        else
+          Target = Addr + Imm * 4;
         return true;
       }
     }

llvm/test/tools/llvm-objdump/ELF/AArch64/pcrel-address.yaml

@@ -2,7 +2,8 @@
 # RUN: llvm-objdump %t -d --no-show-raw-insn --no-leading-addr | FileCheck %s
 
 # CHECK-LABEL: <_start>:
-# CHECK-NEXT:    adrp x2, 0x220000 <_start+0x80>
+# CHECK-NEXT:    adrp x2, 0x220000
+# CHECK-NEXT:    adrp x2, 0x201000 <_start+0xf00>
 
 --- !ELF
 FileHeader:
@@ -15,7 +16,7 @@ Sections:
     Type:    SHT_PROGBITS
     Address: 0x200100
     Flags:   [SHF_ALLOC, SHF_EXECINSTR]
-    Content: '02010090'
+    Content: '02010090020000B0'
   - Name:    .data
     Type:    SHT_PROGBITS
     Flags:   [SHF_ALLOC, SHF_WRITE]