RFR: 8371093: Assert "section header string table should be loaded" failed on debug VM

[Yasumasa Suenaga]

When the crash happens in the function in vDSO on Linux, native call stacks in hs_err log wouldn't be generated as following. See [hs_err log on JBS](https://bugs.openjdk.org/secure/attachment/116796/hs_err_pid4018.log) for details. Reproducer is also attached on JBS ([Test.java](https://bugs.openjdk.org/secure/attachment/116797/Test.java))


Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [linux-vdso.so.1+0xe69]
[error occurred during error reporting (printing native stack (with source info)), id 0xe0000000, Internal Error (/home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/elfFile.cpp:536)]

Retrying call stack printing without source information...

[error occurred during error reporting (retry printing native stack (no source info)), id 0xb, SIGSEGV (0xb) at pc=0x00007fba8075f791]


When I checked back trace on GDB, it failed at `assert`.

#12 0x00007fba7e76bd00 in report_vm_error (file=file at entry=0x7fba7fed7b40 "/home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/elfFile.cpp",
    line=line at entry=536, error_msg=error_msg at entry=0x7fba80019575 "assert(false) failed",
    detail_fmt=detail_fmt at entry=0x7fba7fed7bf0 "section header string table should be loaded")
    at /home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/debug.cpp:196
#13 0x00007fba7e886eb3 in ElfFile::read_section_header (this=0x7fba782a1650, name=0x7fba800367d4 ".gnu_debuglink", hdr=...)
    at /home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/elfFile.cpp:536
#14 ElfFile::read_debug_info (this=this at entry=0x7fba782a1650, debug_info=debug_info at entry=0x7fba7dd05150)
    at /home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/elfFile.cpp:407



(gdb) f 13
#13 0x00007fba7e886eb3 in ElfFile::read_section_header (this=0x7fba782a1650, name=0x7fba800367d4 ".gnu_debuglink", hdr=...)
    at /home/yasuenag/github-forked/jdk/src/hotspot/share/utilities/elfFile.cpp:536
536 assert(false, "section header string table should be loaded");


vDSO is not a regular ELF, so it should be skipped here.

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Commit messages:
 - 8371093: Assert "section header string table should be loaded" failed on debug VM

Changes: https://git.openjdk.org/jdk/pull/28102/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28102&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371093
  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28102.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28102/head:pull/28102

PR: https://git.openjdk.org/jdk/pull/28102