Emit `OpModfStruct` for GLSL `EOpModf` instead of `OpModf` #1086

Job	Run time
iOS	17m 50s
linux (clang, clang++, Debug)	6m 27s
android (ON)	6m 14s
android (OFF)	5m 41s
emscripten	1m 56s
linux (clang, clang++, Release)	6m 48s
Linux Backcompat	14m 31s
linux (gcc, g++, Debug)	6m 32s
linux-asan (gcc, g++, Debug, -fsanitize=address)	8m 40s
linux-asan (gcc, g++, Debug, -fsanitize=thread)	13m 4s
linux (gcc, g++, Release)	5m 32s
linux-asan (gcc, g++, Debug, -fsanitize=undefined)	8m 41s
linux-shared (clang, clang++, Release)	6m 43s
macos (macos-14, clang, clang++, Debug)	4m 51s
linux-shared (gcc, g++, Release)	1m 44s
macos (macos-14, clang, clang++, Release)	3m 28s
macos-shared (macos-14, clang, clang++, Release)	3m 54s
macos (macos-14, gcc, g++, Debug)	4m 30s
windows (windows-2019, windows, Debug)	4m 32s
macos (macos-14, gcc, g++, Release)	3m 44s
windows-shared (windows-2019, windows, Debug)	2m 45s
windows (windows-2019, windows, Release)	5m 18s
macos (macos-13, clang, clang++, Debug)	11m 21s
windows-shared (windows-2019, windows, Release)	5m 11s
macos (macos-13, clang, clang++, Release)	11m 21s
macos (macos-13, gcc, g++, Debug)	10m 58s
macos (macos-13, gcc, g++, Release)	11m 33s
	3h 13m 49s

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