gpu: Fix a race condition in submission processing #8111

Job	Run time
Ubuntu Backcompat	5m 51s
linux (address sanitizer, debug, robinhood ON )	16m 9s
linux (address sanitizer, release, robinhood ON )	2m 48s
linux (thread sanitizer, release, robinhood ON )	2m 7s
linux (address sanitizer, release, robinhood OFF )	3m 30s
android (arm64-v8a, ON, c++_shared)	4m 45s
android (armeabi-v7a, OFF, c++_static)	1m 49s
androidOnLinux	1m 52s
chromium (target_os="linux" target_cpu="x64")	8m 6s
chromium (target_os="android" target_cpu="arm64")	10m 59s
iOS	6m 1s
mingw	2m 54s
windows (amd64)	10m 9s
check_vvl	57s
windows (amd64_x86)	10m 2s
androidUpload	0s
windowsUpload	0s
linux Upload	0s
	1h 27m 59s

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