loader: Lazily allocate ICD surface objects #15

Job	Run time
codegen	14s
linux-32-no-asm	2m 1s
chromium	1m 29s
linux-32 (Debug)	1m 36s
linux (gcc, g++, Debug, ubuntu-20.04)	1s
linux-32 (Release)	2m 10s
linux (gcc, g++, Debug, ubuntu-22.04)	3m 11s
linux-no-asm	3m 24s
linux (gcc, g++, Release, ubuntu-20.04)	1s
linux (gcc, g++, Release, ubuntu-22.04)	7m 12s
linux (clang, clang++, Debug, ubuntu-20.04)	1s
linux (clang, clang++, Debug, ubuntu-22.04)	2m 58s
linux (clang, clang++, Release, ubuntu-20.04)	1s
linux (clang, clang++, Release, ubuntu-22.04)	4m 53s
mingw	1m 41s
mingw-no-asm	1m 14s
mingw-no-asm-explicit	1m 34s
mingw-use-gas	1m 18s
windows_clang (clang, Debug)	3m 52s
windows_vs-no-asm (Win32)	4m 17s
windows_vs (Win32, Debug)	5m 7s
windows_clang (clang, Release)	3m 20s
windows_vs-no-asm (x64)	3m 33s
windows_vs (Win32, Release)	4m 54s
windows_clang (clang-cl, Debug)	3m 44s
windows_vs (x64, Debug)	5m 9s
windows_clang (clang-cl, Release)	3m 18s
windows_vs (x64, Release)	4m 38s
mac (Debug, APPLE_STATIC_LOADER=ON)	3m 30s
iOS	37s
Universal Binary Testing (STATIC ON) w/ Ninja	1m 56s
mac (Debug, APPLE_STATIC_LOADER=OFF)	3m 45s
tvOS	47s
Universal Binary Testing (STATIC ON) w/ Xcode	2m 53s
mac (Release, APPLE_STATIC_LOADER=ON)	3m 37s
Universal Binary Testing (STATIC OFF) w/ Ninja	2m 13s
mac (Release, APPLE_STATIC_LOADER=OFF)	3m 20s
Universal Binary Testing (STATIC OFF) w/ Xcode	3m 41s
	1h 43m 10s

Provide feedback