feat: remove inefficient if check on match lex #2114

Job	Run time
Bench - nightly toolchain (recent)	2m 59s
Docs - stable toolchain (recent)	37s
Docs - nightly toolchain (recent)	45s
Embedded	1m 35s
Format - nightly toolchain	14s
Integration tests - stable toolchain (26_0)	52s
Lint - nightly toolchain (recent)	45s
Integration tests - stable toolchain (25_2)	52s
Test - 1.63.0 toolchain (minimal)	26m 43s
Test - nightly toolchain (minimal)	14m 39s
Integration tests - stable toolchain (25_1)	55s
Test - 1.63.0 toolchain (recent)	26m 59s
Test - nightly toolchain (recent)	15m 3s
Integration tests - stable toolchain (25_0)	1m 1s
Integration tests - stable toolchain (24_2)	1m 15s
Integration tests - stable toolchain (24_1)	48s
Test - stable toolchain (minimal)	16m 23s
Test - stable toolchain (recent)	16m 28s
Integration tests - stable toolchain (24_0_1)	2m 1s
Integration tests - stable toolchain (23_2)	58s
Integration tests - stable toolchain (23_1)	1m 11s
Integration tests - stable toolchain (23_0)	55s
Integration tests - stable toolchain (22_1)	1m 1s
Integration tests - stable toolchain (22_0)	1m 12s
Integration tests - stable toolchain (0_21_2)	48s
Integration tests - stable toolchain (0_20_2)	58s
Integration tests - stable toolchain (0_19_1)	1m 8s
Integration tests - stable toolchain (0_18_1)	1m 14s
Integration tests - stable toolchain (0_17_1)	52s
	2h 21m 11s

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