[llvm] Use MapVector to fix lld thinLTO "nondeterminism" issue. (PR #117551)

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The Buildbot has detected a new failure on builder sanitizer-x86_64-linux-android while building llvm.

Full details are available at:
    https://lab.llvm.org/buildbot/#/builders/186/builds/4513

Worker for this Build: sanitizer-buildbot-android
Blamelist:
    Alan Phipps <[a-phipps at ti.com](mailto:a-phipps at ti.com)>,
    Justin Bogner <[mail at justinbogner.com](mailto:mail at justinbogner.com)>,
    llvmssh <[shaosenhao at huawei.com](mailto:shaosenhao at huawei.com)>

BUILD FAILED: failed 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)

Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure) ...
PASS: HWAddressSanitizer-aarch64 :: TestCases/hwasan_symbolize.cpp (527 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/Posix/ignore_free_hook.cpp (528 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/hwasan_symbolize_stack_uas.cpp (529 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/libc_thread_freeres.c (530 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/heap-buffer-overflow.c (531 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/longjmp-out-of-range.c (532 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/deep-recursion.c (533 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/malloc-test.c (534 of 1721)
PASS: HWAddressSanitizer-aarch64 :: TestCases/malloc-align.c (535 of 1721)
PASS: AddressSanitizer-aarch64-android :: TestCases/use-after-scope-types.cpp (536 of 1721)
FAIL: HWAddressSanitizer-aarch64 :: TestCases/hwasan_symbolize_stack_overflow.cpp (537 of 1721)
******************** TEST 'HWAddressSanitizer-aarch64 :: TestCases/hwasan_symbolize_stack_overflow.cpp' FAILED ******************** Exit Code: 1
I have a problem, I can't see anything in the link above, can't check if my modification caused the above error. @llvmbot @jh7370 

https://github.com/llvm/llvm-project/pull/117551