llvm-readobj: fix next note entry calculation and print unknown note types

[kzhuravl]

Ping.

[yaxunl]

LGTM. Thanks!

test/CodeGen/AMDGPU/runtime-metadata.ll

-; RUN: llc -mtriple=amdgcn--amdhsa -filetype=obj -o - < %s | llvm-readobj -amdgpu-runtime-metadata | FileCheck %s
+; RUN: llc -mtriple=amdgcn--amdhsa -filetype=obj -o - < %s | llvm-readobj -amdgpu-runtime-metadata -elf-output-style=GNU -notes | FileCheck %s --check-prefix=NOTES
 ; RUN: llc -mtriple=amdgcn--amdhsa -filetype=obj -amdgpu-dump-rtmd -amdgpu-check-rtmd-parser %s -o - 2>&1 | FileCheck --check-prefix=CHECK --check-prefix=PARSER %s
 
 %struct.A = type { i8, float }
 %opencl.image1d_t = type opaque
 %opencl.image2d_t = type opaque
 %opencl.image3d_t = type opaque
 %opencl.queue_t = type opaque
 %opencl.pipe_t = type opaque

 define amdgpu_kernel void @test_pointee_align(i64 addrspace(1)* %a, i8 addrspace(3)* %b, <2 x i8> addrspace(3)* %c, <3 x i8> addrspace(3)* %d, <4 x i8> addrspace(3)* %e, <8 x i8> addrspace(3)* %f, <16 x i8> addrspace(3)* %g) !kernel_arg_addr_space !91 !kernel_arg_access_qual !92 !kernel_arg_type !93 !kernel_arg_base_type !93 !kernel_arg_type_qual !94 {
   ret void
 }
 
 ; CHECK-NEXT:...
 
 ; PARSER: AMDGPU runtime metadata parser test passes.
 
+; NOTES: Displaying notes found at file offset 0x{{[0-9]+}}
+; NOTES-NEXT: Owner    Data size    Description
+; NOTES-NEXT: AMD      0x00000008   Unknown note type: (0x00000001)
+; NOTES-NEXT: AMD      0x0000001b   Unknown note type: (0x00000003)
+; NOTES-NEXT: AMD      0x00005196   Unknown note type: (0x00000008)
+
 !llvm.printf.fmts = !{!100, !101}
 
 !1 = !{i32 0}
 !2 = !{!"none"}
 !3 = !{!"int"}
 !4 = !{!""}
 !5 = !{i32 undef, i32 1}
 !6 = !{i32 1, i32 2, i32 4}

tools/llvm-readobj/ELFDumper.cpp

while (P < E) {
             StringRef(reinterpret_cast<const char *>(&Words[3]), NameSize - 1);
 
       OS << "  " << Name << std::string(22 - NameSize, ' ')
          << format_hex(DescriptorSize, 10) << '\t';
 
       if (Name == "GNU") {
         OS << getGNUNoteTypeName(Type) << '\n';
         printGNUNote<ELFT>(OS, Type, Descriptor);
+      } else {
+        OS << "Unknown note type: (" << format_hex(Type, 10) << ')';
       }
       OS << '\n';
 
-      P = P + 3 * sizeof(Elf_Word) * alignTo<4>(NameSize) +
+      P = P + 3 * sizeof(Elf_Word) + alignTo<4>(NameSize) +
           alignTo<4>(DescriptorSize);
     }
   };
 
   if (IsCore) {
     for (const auto &P : unwrapOrError(Obj->program_headers()))
       if (P.p_type == PT_NOTE)
         process(P.p_offset, P.p_filesz);