LLVM 18 support

[ahueck]

LLVM 18 Compatibility

• Updates to compile with LLVM 18.
• Enabled the new PassManager (PM) for LLVM 14 and 18, replacing legacy components.
• Support opaque pointers with llvm-dimeta

Configuration Enhancements

• Support for parsing pass options from both CLI and environment variables.
  • Environment variables can now configure passes, with priority: single env → global env → (static) pass config.

Compiler Wrapper

• Introduced a new compiler wrapper using -fpass-plugin
  • Debugging capabilities by generating IR module dumps.

Misc

• Added full CI support for LLVM 18, including automated tests and issue fixes.
• Support for array cookies with opaque pointers.
• Fixed issues related to llvm-dimeta, naming of anon structs, void pointer size calculations, and array cookie detection.
• Changed default naming conventions for type files.
• Bug fixes

[coveralls]

Pull Request Test Coverage Report for Build 13528988609

Details

• 974 of 1122 (86.81%) changed or added relevant lines in 38 files are covered.
• 30 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-1.9%) to 88.854%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/passes/configuration/TypeARTOptions.h	14	15	93.33%
lib/passes/support/Util.h	5	6	83.33%
lib/support/Table.h	63	64	98.44%
lib/passes/instrumentation/TypeARTFunctions.cpp	15	17	88.24%
lib/passes/typegen/dimeta/DimetaTypeGen.cpp	50	52	96.15%
lib/runtime/Runtime.cpp	10	12	83.33%
lib/runtime/TypeResolution.cpp	16	18	88.89%
lib/typelib/TypeDB.cpp	2	4	50.0%
lib/passes/analysis/MemOpVisitor.cpp	54	57	94.74%
lib/passes/configuration/OptionsUtil.h	23	26	88.46%

Files with Coverage Reduction	New Missed Lines	%
lib/passes/analysis/MemOpVisitor.cpp	1	95.85%
lib/runtime/Runtime.cpp	1	93.55%
lib/passes/TypeARTPass.cpp	3	83.61%
lib/passes/Commandline.cpp	4	93.28%
lib/passes/TypeARTConfiguration.cpp	4	68.18%
lib/passes/analysis/MemInstFinder.cpp	17	88.75%

Totals
Change from base Build 12905013308:	-1.9%
Covered Lines:	4201
Relevant Lines:	4728

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💛 - Coveralls