feat!: make sure constructors don't get optimised out

[ghaith]

Adds an LLVM C++ Wrapper that provides access to mark the compiled application to use the elf .init_array constructors.
Removes the built in linker scripts and deprecates the --no-linker-script flag.
This is a breaking change as the init functions are no longer visible in the binary.

This PR also activates builds on aarch64 (arm64) and for that we needed to filter out alignmets from all the tests.

[codecov]

Codecov Report

❌ Patch coverage is 75.72816% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.64%. Comparing base (54406fb) to head (e69b8fe).
⚠️ Report is 86 commits behind head on master.

Files with missing lines	Patch %	Lines
src/codegen/debug.rs	52.00%	12 Missing ⚠️
compiler/plc_llvm/build.rs	74.41%	11 Missing ⚠️
compiler/plc_driver/src/pipelines.rs	50.00%	1 Missing ⚠️
src/codegen/generators/pou_generator.rs	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1540      +/-   ##
==========================================
- Coverage   94.95%   94.64%   -0.31%     
==========================================
  Files         174      187      +13     
  Lines       56307    58487    +2180     
==========================================
+ Hits        53464    55354    +1890     
- Misses       2843     3133     +290     

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[Copilot]

Pull request overview

This PR updates the codebase to ensure constructors are not optimized out by using the ELF .init_array section. It removes built-in linker scripts, deprecates the --no-linker-script flag, and enables builds on aarch64 (arm64) architecture. To support cross-architecture compatibility, alignment values in test snapshots have been filtered out.

Changes:

• Modified LLVM global constructors to use priority 65535 instead of 0 for the .init_array section
• Updated all test snapshots to replace specific alignment values with [filtered] placeholders
• Added a new alignment_tests module to handle architecture-specific alignment testing

Reviewed changes

Copilot reviewed 295 out of 407 changed files in this pull request and generated 2 comments.

File	Description
src/codegen/tests/snapshots/*.snap	Updated test snapshots to filter out alignment values for cross-architecture compatibility
src/codegen/tests.rs	Added new alignment_tests module

Comments suppressed due to low confidence (3)

src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_var_array_added_to_debug_info.snap:1

• The removal of the snapshot_kind: text metadata line is inconsistent with the PR description which mentions filtering alignments but doesn't mention metadata changes. Verify that this metadata removal is intentional and doesn't affect test execution.

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src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__global_alias_type.snap:1

• The removal of the snapshot_kind: text metadata line is inconsistent with the PR description which mentions filtering alignments but doesn't mention metadata changes. Verify that this metadata removal is intentional and doesn't affect test execution.

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src/codegen/tests/snapshots/rusty__codegen__tests__debug_tests__dwarf_version_override.snap:1

• The removal of the snapshot_kind: text metadata line is inconsistent with the PR description which mentions filtering alignments but doesn't mention metadata changes. Verify that this metadata removal is intentional and doesn't affect test execution.

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[Copilot]

Pull request overview

Copilot reviewed 295 out of 408 changed files in this pull request and generated 12 comments.

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