[llvm] Revert "[MachO] Preserve weak linkage for aliases" (PR #212009)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-04` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/161/builds/12451

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: tools/llvm-debuginfod-find/timeout.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 3
rm -rf C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp
# executed command: rm -rf 'C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp'
# RUN: at line 4
mkdir -p C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp/debuginfod-cache
# executed command: mkdir -p 'C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp/debuginfod-cache'
# RUN: at line 7
env DEBUGINFOD_TIMEOUT=1  env DEBUGINFOD_CACHE=C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp/debuginfod-cache  env DEBUGINFOD_HEADERS_FILE=C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers    "C:\Users\tcwg\scoop\apps\python\current\python.exe" C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/delay_req.py c:\users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\bin\llvm-debuginfod-find.exe --debuginfo 0 | c:\users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\bin\filecheck.exe C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find\timeout.test
# executed command: env DEBUGINFOD_TIMEOUT=1 env 'DEBUGINFOD_CACHE=C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\test\tools\llvm-debuginfod-find\Output\timeout.test.tmp/debuginfod-cache' env 'DEBUGINFOD_HEADERS_FILE=C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers' 'C:\Users\tcwg\scoop\apps\python\current\python.exe' 'C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/delay_req.py' 'c:\users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\bin\llvm-debuginfod-find.exe' --debuginfo 0
# .---command stderr------------
# | 127.0.0.1 - - [25/Jul/2026 13:09:38] "GET /buildid/00/debuginfo HTTP/1.1" 501 -
# `-----------------------------
# executed command: 'c:\users\tcwg\llvm-worker\clang-arm64-windows-msvc\build\bin\filecheck.exe' 'C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find\timeout.test'
# .---command stderr------------
# | C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find\timeout.test:13:13: error: CHECK-SAME: expected string not found in input
# | CHECK-SAME: Timeout was reached
# |             ^
# | <stdin>:5:13: note: scanning from here
# | Build ID 00: Failed to receive HTTP response
# |             ^
# | <stdin>:5:14: note: possible intended match here
# | Build ID 00: Failed to receive HTTP response
# |              ^
# | 
# | Input file: <stdin>
# | Check file: C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find\timeout.test
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            1: warning: could not parse debuginfod header: C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers:3
# |  
# |            2: warning: could not parse debuginfod header: C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers:4
# |  
# |            3: warning: could not parse debuginfod header: C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers:5
# |  
# |            4: warning: could not parse debuginfod header: C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm-project\llvm\test\tools\llvm-debuginfod-find/Inputs/headers:6
# |  
# |            5: Build ID 00: Failed to receive HTTP response
# |  
# | same:13'0                {                                    search range start (exclusive)
# | same:13'1                                                     error: no match found in search range
# | same:13'2                  ?                                  possible intended match
# |            6:  
...

```

</details>

https://github.com/llvm/llvm-project/pull/212009