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CL 425314 made creating funcTypes using StructOf, and using a mutex to
protect read+write to funcTypes. However, after initializing funcTypes,
it is accessed in FuncOf without holding lock, causing a race.

Fixing it by returning the n-th Type directly from initFuncTypes, so the
accessing funcTypes will always be guarded by a mutex.

Fixes #56011

Change-Id: I1b50d1ae342943f16f368b8606f2614076dc90fb
Reviewed-by: Keith Randall <>
Run-TryBot: Cuong Manh Le <>
Auto-Submit: Cuong Manh Le <>
TryBot-Result: Gopher Robot <>
Reviewed-by: Bryan Mills <>
Reviewed-by: Keith Randall <>


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