[lld] [LLD][COFF] Implement support for hybrid IAT on ARM64X (PR #124189)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `lld` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/13515

<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 'lld :: COFF/arm64x-import.test' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: split-file /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/arm64x-import.test /Users/buildbot/buildbot-root/aarch64-darwin/build/tools/lld/test/COFF/Output/arm64x-import.test.tmp.dir && cd /Users/buildbot/buildbot-root/aarch64-darwin/build/tools/lld/test/COFF/Output/arm64x-import.test.tmp.dir
+ split-file /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/arm64x-import.test /Users/buildbot/buildbot-root/aarch64-darwin/build/tools/lld/test/COFF/Output/arm64x-import.test.tmp.dir
+ cd /Users/buildbot/buildbot-root/aarch64-darwin/build/tools/lld/test/COFF/Output/arm64x-import.test.tmp.dir
RUN: at line 4: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12-thunks-arm64ec.s -o func12-thunks-arm64ec.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12-thunks-arm64ec.s -o func12-thunks-arm64ec.obj
RUN: at line 5: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func12-thunks-arm64.s -o func12-thunks-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func12-thunks-arm64.s -o func12-thunks-arm64.obj
RUN: at line 6: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12-arm64ec.s -o func12-arm64ec.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12-arm64ec.s -o func12-arm64ec.obj
RUN: at line 7: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func123-arm64.s -o func123-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func123-arm64.s -o func123-arm64.obj
RUN: at line 8: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func123-arm64ec.s -o func123-arm64ec.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func123-arm64ec.s -o func123-arm64ec.obj
RUN: at line 9: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func12-arm64.s -o func12-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func12-arm64.s -o func12-arm64.obj
RUN: at line 10: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func234-arm64.s -o func234-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func234-arm64.s -o func234-arm64.obj
RUN: at line 11: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12o-arm64ec.s -o func12o-arm64ec.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows func12o-arm64ec.s -o func12o-arm64ec.obj
RUN: at line 12: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func34-arm64.s -o func34-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func34-arm64.s -o func34-arm64.obj
RUN: at line 13: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func34o-arm64.s -o func34o-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows func34o-arm64.s -o func34o-arm64.obj
RUN: at line 14: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows funco-arm64.s -o funco-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows funco-arm64.s -o funco-arm64.obj
RUN: at line 15: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows icall.s -o icall.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows icall.s -o icall.obj
RUN: at line 16: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/Inputs/loadconfig-arm64ec.s -o loadconfig-arm64ec.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=arm64ec-windows /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/Inputs/loadconfig-arm64ec.s -o loadconfig-arm64ec.obj
RUN: at line 17: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/Inputs/loadconfig-arm64.s -o loadconfig-arm64.obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-mc -filetype=obj -triple=aarch64-windows /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/lld/test/COFF/Inputs/loadconfig-arm64.s -o loadconfig-arm64.obj
RUN: at line 18: llvm-lib -machine:arm64ec -def:imp.def -out:imp-arm64ec.lib
+ llvm-lib -machine:arm64ec -def:imp.def -out:imp-arm64ec.lib
RUN: at line 19: llvm-lib -machine:arm64 -def:imp.def -out:imp-arm64.lib
+ llvm-lib -machine:arm64 -def:imp.def -out:imp-arm64.lib
RUN: at line 20: llvm-lib -machine:arm64x -def:imp.def -defArm64Native:imp.def -out:imp-arm64x.lib
+ llvm-lib -machine:arm64x -def:imp.def -defArm64Native:imp.def -out:imp-arm64x.lib
RUN: at line 21: llvm-lib -machine:arm64x -def:imp-ord10.def -defArm64Native:imp.def -out:imp-ecord.lib
+ llvm-lib -machine:arm64x -def:imp-ord10.def -defArm64Native:imp.def -out:imp-ecord.lib
RUN: at line 22: llvm-lib -machine:arm64x -def:imp-ord10.def -defArm64Native:imp-ord20.def -out:imp-ecord.lib
+ llvm-lib -machine:arm64x -def:imp-ord10.def -defArm64Native:imp-ord20.def -out:imp-ecord.lib
RUN: at line 23: llvm-lib -machine:arm64x -def:imp2.def -defArm64Native:imp2.def -out:imp2.lib
+ llvm-lib -machine:arm64x -def:imp2.def -defArm64Native:imp2.def -out:imp2.lib
RUN: at line 24: llvm-lib -machine:arm64x -def:noname-ec.def -defArm64Native:noname-native.def -out:noname.lib
+ llvm-lib -machine:arm64x -def:noname-ec.def -defArm64Native:noname-native.def -out:noname.lib
...

```

</details>

https://github.com/llvm/llvm-project/pull/124189