go/types, types2: align trace output a bit better for easier debugging

Compute alignment padding rather than using a tab in trace output.
This aligns the ":" after the file position in typical cases (files
shorter than 1000 lines, lines shorter than 100 columns), resulting
in nicer trace output for easier debugging.

Before this CL (example trace):

x.go:8:2:  -- checking type A (white, objPath = )
x.go:8:11:  .  -- type B
x.go:9:2:  .  .  -- checking type B (white, objPath = A)
x.go:9:14:  .  .  .  -- type C[D]
x.go:9:13:  .  .  .  .  -- instantiating type C with [D]
x.go:9:13:  .  .  .  .  .  -- type C
x.go:10:2:  .  .  .  .  .  .  -- checking type C (white, objPath = A->B)
x.go:10:6:  .  .  .  .  .  .  .  -- type any
x.go:10:6:  .  .  .  .  .  .  .  => any (under = any) // *Alias
x.go:10:11:  .  .  .  .  .  .  .  -- type struct{}
x.go:10:11:  .  .  .  .  .  .  .  => struct{} // *Struct
x.go:10:2:  .  .  .  .  .  .  => type C[_ any] struct{} (black)

With this CL:

x.go:8:2   :  -- checking type A (white, objPath = )
x.go:8:11  :  .  -- type B
x.go:9:2   :  .  .  -- checking type B (white, objPath = A)
x.go:9:14  :  .  .  .  -- type C[D]
x.go:9:13  :  .  .  .  .  -- instantiating type C with [D]
x.go:9:13  :  .  .  .  .  .  -- type C
x.go:10:2  :  .  .  .  .  .  .  -- checking type C (white, objPath = A->B)
x.go:10:6  :  .  .  .  .  .  .  .  -- type any
x.go:10:6  :  .  .  .  .  .  .  .  => any (under = any) // *Alias
x.go:10:11 :  .  .  .  .  .  .  .  -- type struct{}
x.go:10:11 :  .  .  .  .  .  .  .  => struct{} // *Struct
x.go:10:2  :  .  .  .  .  .  .  => type C[_ any] struct{} (black)

Change-Id: Ibcf346737f57ec5351d1e1e65178e2c3c155d766
Reviewed-on: https://go-review.googlesource.com/c/go/+/659755
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

0 files changed, 0 insertions, 0 deletions