[Based on #120] cmd: add LLDB views for interfaces and function values

[cpunion]

Summary

• load interface and function-value layouts from the common debugger ABI schema introduced by [Based on #114] debug: define the common debugger ABI #120
• show nil and dynamic concrete types for empty and non-empty interfaces
• resolve ordinary and named function values to symbols, and identify closures and bound methods
• execute every covered value in the fixture before inspecting it

Tracks xgo-dev#2154 and xgo-dev#2164. Based on #120.

Tests

• macOS arm64, Apple LLDB 1703: 243/243 integration assertions
• Linux amd64, LLVM LLDB 19.1.7: 243/243 integration assertions
• macOS arm64 and Linux amd64: go test ./cmd/...
• macOS arm64 and Linux amd64: cmd/internal/lldb coverage 87.5%
• full PR CI: 39 successful jobs, one expected skipped release job
• Python syntax checks and git diff --check

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[github-actions]

LLGo baseline benchmarks

48ce57e35de3 | workflow run | long-term charts

Program measurements

Platform	Workload	File size	vs main	Build	vs main	Run	vs main
Linux	cprintf	18544 B	+0.0%	344.346 ms	-16.5% (better)	1.362 ms	-12.3% (better)
Linux	fmtprintf	2217608 B	+0.2% (worse)	3.211 s	-16.7% (better)	2.713 ms	-17.5% (better)
Linux	println	71504 B	-1.6% (better)	354.966 ms	-11.3% (better)	1.695 ms	+1.3% (worse)
macOS	cprintf	84672 B	+0.0%	307.763 ms	-25.7% (better)	2.443 ms	-31.9% (better)
macOS	fmtprintf	2361520 B	+0.7% (worse)	3.789 s	-3.8% (better)	21.814 ms	-6.7% (better)
macOS	println	125712 B	-1.0% (better)	310.929 ms	-25.0% (better)	3.494 ms	-51.9% (better)

Core language and compiler benchmarks

Platform	Benchmark	ns/op	vs main
Linux	BenchmarkLookupPCRandom	12.270 ns/op	-9.0% (better)
Linux	BenchmarkMergeCompilerFlags	148.600 ns/op	-3.8% (better)
Linux	BenchmarkMergeLinkerFlags	95.060 ns/op	-6.2% (better)
Linux	BenchmarkChannelBuffered	36.320 ns/op	+4.5% (worse)
Linux	BenchmarkChannelHandoff	25913 ns/op	-19.1% (better)
Linux	BenchmarkDefer	42.530 ns/op	-24.5% (better)
Linux	BenchmarkDirectCall	1.758 ns/op	+12.5% (worse)
Linux	BenchmarkGlobalRead	1.759 ns/op	+12.8% (worse)
Linux	BenchmarkGlobalWrite	2.806 ns/op	+12.5% (worse)
Linux	BenchmarkGoroutine	36752 ns/op	-51.4% (better)
Linux	BenchmarkInterfaceCall	8.792 ns/op	+12.8% (worse)
Linux	BenchmarkRuntimeGetG	1.759 ns/op	-66.9% (better)
macOS	BenchmarkLookupPCRandom	13.030 ns/op	+4.7% (worse)
macOS	BenchmarkMergeCompilerFlags	143.700 ns/op	+15.4% (worse)
macOS	BenchmarkMergeLinkerFlags	93.370 ns/op	+34.6% (worse)
macOS	BenchmarkChannelBuffered	28.740 ns/op	+3.6% (worse)
macOS	BenchmarkChannelHandoff	8389 ns/op	+19.7% (worse)
macOS	BenchmarkDefer	52.070 ns/op	+39.1% (worse)
macOS	BenchmarkDirectCall	1.235 ns/op	-15.0% (better)
macOS	BenchmarkGlobalRead	1.243 ns/op	+2.6% (worse)
macOS	BenchmarkGlobalWrite	1.300 ns/op	-12.6% (better)
macOS	BenchmarkGoroutine	38720 ns/op	+22.3% (worse)
macOS	BenchmarkInterfaceCall	5.318 ns/op	-1.5% (better)
macOS	BenchmarkRuntimeGetG	2.305 ns/op	-10.6% (better)

Compared only with the latest matching platform in the main series.

Warning

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