Emit `OpModfStruct` for GLSL `EOpModf` instead of `OpModf` #1089

Job	Run time
emscripten	2m 2s
iOS	4m 41s
android (ON)	1m 9s
linux (clang, clang++, Debug)	2m 2s
android (OFF)	5m 33s
Linux Backcompat	3m 10s
linux (clang, clang++, Release)	1m 24s
linux-asan (gcc, g++, Debug, -fsanitize=address)	3m 35s
linux (gcc, g++, Debug)	7m 13s
linux-asan (gcc, g++, Debug, -fsanitize=thread)	8m 23s
linux-shared (clang, clang++, Release)	1m 20s
linux (gcc, g++, Release)	1m 40s
linux-asan (gcc, g++, Debug, -fsanitize=undefined)	3m 36s
linux-shared (gcc, g++, Release)	1m 37s
macos (macos-14, clang, clang++, Debug)	4m 1s
macos (macos-14, clang, clang++, Release)	4m 9s
macos-shared (macos-14, clang, clang++, Release)	3m 33s
macos (macos-14, gcc, g++, Debug)	5m 11s
windows (windows-2019, windows, Debug)	4m 28s
windows-shared (windows-2019, windows, Debug)	3m 46s
macos (macos-14, gcc, g++, Release)	3m 30s
windows (windows-2019, windows, Release)	6m 39s
windows-shared (windows-2019, windows, Release)	6m 0s
macos (macos-13, clang, clang++, Debug)	9m 11s
macos (macos-13, clang, clang++, Release)	14m 11s
macos (macos-13, gcc, g++, Debug)	13m 11s
macos (macos-13, gcc, g++, Release)	13m 23s
	2h 18m 38s

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