MCAsmStreamer: Print relocation type number if applicable

The fixup output is a debug aid and should not be used to test
target-specific relocation generation implementation. The llvm-mc
-filetype=obj output is what truly matters.

Author: MaskRay

llvm/lib/MC/MCAsmStreamer.cpp

@@ -2399,12 +2399,16 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
 
   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
     MCFixup &F = Fixups[i];
-    const MCFixupKindInfo &Info =
-        getAssembler().getBackend().getFixupKindInfo(F.getKind());
     OS << "  fixup " << char('A' + i) << " - "
        << "offset: " << F.getOffset() << ", value: ";
     F.getValue()->print(OS, MAI);
-    OS << ", kind: " << Info.Name << "\n";
+    auto Kind = F.getKind();
+    if (FirstRelocationKind <= Kind)
+      OS << ", relocation type: " << (Kind - FirstRelocationKind);
+    else
+      OS << ", kind: "
+         << getAssembler().getBackend().getFixupKindInfo(Kind).Name;
+    OS << '\n';
   }
 }
 

llvm/test/MC/AArch64/tls-relocs.s

@@ -389,7 +389,7 @@
 // CHECK: add    x5, x4, :tlsdesc_lo12:var // encoding: [0x85,0bAAAAAA00,0b00AAAAAA,0x91]
 // CHECK:                                  //   fixup A - offset: 0, value: :tlsdesc_lo12:var, kind: fixup_aarch64_add_imm12
 // CHECK: .tlsdesccall var                // encoding: []
-// CHECK-NEXT:                            //   fixup A - offset: 0, value: var, kind: FK_NONE
+// CHECK-NEXT:                            //   fixup A - offset: 0, value: var, relocation type: 569
 // CHECK: blr    x3                      // encoding: [0x60,0x00,0x3f,0xd6]
 
 // CHECK-ELF-NEXT:     0x104 R_AARCH64_TLSDESC_ADR_PAGE21 [[VARSYM]]