Phase 122: Remove 6 additional unused legacy functions from ltvalue.h #142

Job	Run time
Build & Test (gcc-13, Debug)	48s
Performance Regression Check	1m 23s
Build & Test (clang-15, Release)	31s
Build & Test (clang-15, Debug)	38s
Code Quality Checks	1m 1s
Sanitizer Tests (ASAN + UBSAN)	32s
Build & Test (gcc-13, Release)	40s
Build Summary	3s
	5m 36s

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