gpuav: Improve shader map management #10408

Job	Run time
code-format	28s
check_vvl	1m 4s
windows (amd64)	10m 14s
chromium (target_os="linux" target_cpu="x64")	8m 14s
windows (amd64_x86)	10m 26s
android (arm64-v8a, ON, c++_shared)	9m 1s
chromium (target_os="android" target_cpu="arm64")	11m 33s
androidOnLinux	6m 45s
android (armeabi-v7a, OFF, c++_static)	3m 35s
linux (address sanitizer, debug, robinhood ON )	32m 59s
linux (thread sanitizer, release, robinhood ON )	10m 26s
linux (address sanitizer, release, robinhood ON )	23m 41s
mingw	7m 36s
linux (address sanitizer, release, robinhood OFF )	26m 11s
windowsUpload	0s
iOS	4m 22s
androidUpload	0s
linux Upload	0s
	2h 46m 35s

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