`fn decomp_tx`: Do not zero `txa` before initialization (#1265) #860

Job	Run time
test-on-ubuntu-latest (x86_64-unknown-linux-gnu, release, --release --no-default-features --featu...	17m 58s
test-on-ubuntu-latest (x86_64-unknown-linux-gnu, release, --release)	10m 9s
	28m 7s

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