reflect: fix type metadata and MakeFunc results

[cpunion]

Summary

• fix reflected PkgPath metadata for command-line-arguments fields and unsafe.Pointer
• skip writes to blank struct fields while preserving initializer side effects
• validate reflect.MakeFunc result counts/types and pass MakeFunc func values correctly through reflect.Value.Call

Coverage

• adds test/go llgo probe for PkgPath, blank fields, MakeFunc error panics, and MakeFunc bool funcs passed through reflect.Value.Call
• removes xfail entries for fixedbugs issue10332, issue28748, issue31546, issue44830, issue52788, and issue52788a

Tests

• go test ./test/go -run TestReflectTypeMetadataMakeFuncProbe -count=1
• go test ./test/goroot -run TestGoRoot -count=1 -timeout=8m -args -goroot /opt/homebrew/Cellar/go@1.25/1.25.7_1/libexec -llgo /tmp/llgo-reflect-coverage -dirs fixedbugs -directive-mode ci -case "fixedbugs/(issue10332|issue28748|issue31546|issue44830|issue52788|issue52788a)\.go$" -run-timeout 90s
• go test ./test/goroot ... same case filter with -xfail /tmp/llgo-no-xfail.yaml on Go 1.24.11, Go 1.25.7, and Go 1.26.0

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 58.82353% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ssa/abitype.go	50.00%	2 Missing and 2 partials ⚠️
cl/compile.go	66.66%	2 Missing and 1 partial ⚠️

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