cmd/internal/obj: use correct symbol size for Hashed64 classification
Use sym.Size, instead of len(sym.P), to decide whether a
content-addressable symbol is "short" and hashed as Hashed64.
So we don't dedup a small symbol with a gigantic almost-zero
symbol.
Fixes #42140.
Change-Id: Ic65869e1eaf51947517b3ece49c8b0be1b94bb75
Reviewed-on: https://go-review.googlesource.com/c/go/+/264337
Trust: Cherry Zhang <cherryyz@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Than McIntosh <thanm@google.com>