cmd/compile: remove debugging option InlineSCCOnePass from inliner
Delete the "InlineSCCOnePass" debugging flag and the inliner fallback
code that kicks in if it is used. The change it was intended to guard
has been working on tip for some time, no need for the fallback any
more.
Updates #58905.
Change-Id: I2e1dbc7640902d9402213db5ad338be03deb96c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/492015 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>