Fix detection of inconsistent renames due to sunk values. #596

Job	Run time
debug / debug	10m 2s
debug / debug	10m 2s
coverage / coverage	15m 31s
coverage / coverage	15m 31s
debug ASAN clang / debug_asan_clang	29m 19s
debug ASAN clang / debug_asan_clang	29m 19s
debug aarch64 / debug_aarch64	32m 33s
debug aarch64 / debug_aarch64	30m 29s
gcc centos 7 / default_gcc_centos_7	8m 57s
gcc centos 7 / default_gcc_centos_7	8m 57s
out of source / out_of_source	8m 51s
out of source / out_of_source	8m 51s
release / release	6m 28s
release / release	6m 28s
release ASAN clang / release_asan_clang	23m 38s
release ASAN clang / release_asan_clang	23m 38s
release clang / release_clang	6m 18s
release clang / release_clang	6m 18s
release lto / release_lto	15m 34s
release lto / release_lto	15m 34s
release lto clang / release_lto_clang	12m 31s
release lto clang / release_lto_clang	12m 31s
static build / static_build	6m 52s
static build / static_build	6m 52s
	5h 51m 4s

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