runtime(ssa): improve syntax file performance #16493

Job	Run time
macos (tiny, macos-12)	1m 41s
windows (HUGE, msvc, no, no, x64, stable)	6m 34s
macos (tiny, macos-14)	40s
linux (tiny, clang, native)	1m 41s
windows (HUGE, mingw, yes, yes, x86, stable, yes)	10m 7s
macos (normal, macos-12)	7m 21s
linux (tiny, gcc, native)	1m 52s
windows (HUGE, msvc, no, yes, x86)	8m 44s
macos (normal, macos-14)	4m 15s
linux (normal, clang, native)	4m 46s
windows (HUGE, mingw, yes, no, x64, yes)	9m 28s
macos (huge, macos-12)	15m 23s
linux (normal, gcc, native)	5m 17s
windows (NORMAL, msvc, yes, no, x86)	6m 26s
macos (huge, macos-14)	13m 11s
linux (huge, clang, native)	9m 5s
windows (NORMAL, mingw, no, yes, x64)	8m 41s
linux (huge, gcc, native)	9m 46s
windows (TINY, msvc, yes, yes, x64)	2m 1s
linux (tiny, clang, nogui)	1m 37s
windows (TINY, mingw, no, no, x86)	2m 25s
linux (tiny, gcc, nogui)	1m 39s
linux (normal, gcc, i386, ./src/shadow)	5m 37s
linux (huge, gcc, uchar, testgui, true, dynamic)	27m 23s
linux (huge, clang, asan, 5.1)	15m 55s
linux (huge, gcc, unittests, true)	2m 4s
linux (normal, gcc, vimtags)	2m 8s
	3h 5m 47s

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