Lexer: Fix location of token after line continuation #13502

Job	Run time
check_format	1m 33s
x86_64-gnu-test-preview_mt	5m 55s
x86_64-gnu-test (1.7.3)	36m 37s
x86_64-gnu-test (1.8.2)	34m 49s
x86_64-musl-test	36m 46s
x86_64-gnu-test (1.9.2)	34m 56s
x86_64-gnu-test (1.10.1)	35m 36s
x86_64-gnu-test (1.11.2)	33m 28s
x86_64-gnu-test (1.12.2)	33m 21s
x86_64-gnu-test (1.13.3)	35m 27s
x86_64-gnu-test (1.14.1)	34m 44s
x86_64-gnu-test (1.15.1)	36m 11s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 57s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	37m 11s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 5s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	36m 54s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 49s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	36m 23s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 36s
	10h 7m 18s

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