opaque-debug: support generics (#1053) #470

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	3m 24s
build (1.60.0, wasm32-unknown-unknown)	3m 27s
build (stable, thumbv7em-none-eabi)	8s
build (stable, wasm32-unknown-unknown)	6s
cross (aarch64-unknown-linux-gnu, 1.60.0)	3m 58s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	3m 36s
cross (aarch64-unknown-linux-gnu, stable)	28s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	3m 19s
cross (powerpc-unknown-linux-gnu, 1.60.0)	3m 44s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	3m 57s
cross (powerpc-unknown-linux-gnu, stable)	31s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	4m 56s
minimal-versions / minimal-versions	19s
	31m 53s

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