Heap-buffer-overflow in slurp_hppa_unwind_table

```
==1347392==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000000c0 at pc 0x00000059ea61 bp 0x7ffe24486810 sp 0x7ffe24486808
WRITE of size 2 at 0x6020000000c0 thread T0
    #0 0x59ea60 in slurp_hppa_unwind_table /src/binutils-gdb/binutils/./readelf.h:8241:36
    #1 0x595156 in hppa_process_unwind /src/binutils-gdb/binutils/./readelf.h:8313:17
    #2 0x572c83 in process_unwind /src/binutils-gdb/binutils/./readelf.h:9463:14
    #3 0x564fbc in process_object /src/binutils-gdb/binutils/./readelf.h:20001:9
    #4 0x558bdd in process_file /src/binutils-gdb/binutils/./readelf.h:20480:13
    #5 0x558fc2 in LLVMFuzzerTestOneInput /src/binutils-gdb/binutils/fuzz_readelf.c:53:2
    #6 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #7 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #8 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #9 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #10 0x7f4785c17b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)
    #11 0x423179 in _start (/root/oss-fuzz/build/out/binutils/fuzz_readelf+0x423179)

DEDUP_TOKEN: slurp_hppa_unwind_table--hppa_process_unwind--process_unwind
0x6020000000c0 is located 15 bytes to the right of 1-byte region [0x6020000000b0,0x6020000000b1)
allocated by thread T0 here:
    #0 0x52287d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x66909c in xmalloc /src/binutils-gdb/libiberty/./xmalloc.c:147:12
    #2 0x5bf1d9 in xcmalloc /src/binutils-gdb/binutils/dwarf.c:10249:10
    #3 0x59dc52 in slurp_hppa_unwind_table /src/binutils-gdb/binutils/./readelf.h:8134:7
    #4 0x595156 in hppa_process_unwind /src/binutils-gdb/binutils/./readelf.h:8313:17
    #5 0x572c83 in process_unwind /src/binutils-gdb/binutils/./readelf.h:9463:14
    #6 0x564fbc in process_object /src/binutils-gdb/binutils/./readelf.h:20001:9
    #7 0x558bdd in process_file /src/binutils-gdb/binutils/./readelf.h:20480:13
    #8 0x558fc2 in LLVMFuzzerTestOneInput /src/binutils-gdb/binutils/fuzz_readelf.c:53:2
    #9 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #10 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #11 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #12 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #13 0x7f4785c17b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmalloc--xcmalloc
SUMMARY: AddressSanitizer: heap-buffer-overflow /src/binutils-gdb/binutils/./readelf.h:8241:36 in slurp_hppa_unwind_table
Shadow bytes around the buggy address:
  0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa 00 00 fa fa 00 fa fa fa 00 fa fa fa 00 fa
=>0x0c047fff8010: fa fa fd fd fa fa 01 fa[fa]fa fa fa fa fa fa fa
  0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==1347392==ABORTING
```

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