[dev.typeparams] cmd/compile: report functions declared in Go and assembly

This CL reuses the symabi wrapper information to warn when a function
is defined both in Go (i.e., has a function declaration with a body)
and in assembly (i.e., has a TEXT instruction).

This will eventually produce a linker error anyway, but we can provide
a slightly nicer error message earlier.

Change-Id: Ia107f813343c0b10f4cd1013e7c72e67149ee52e
Reviewed-on: https://go-review.googlesource.com/c/go/+/333454


Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>