Update compiler invocations to pass "-p <importpath>", since that
is the normal way to invoke the compiler these days. In addition,
add some logic to generate a 'symabis' file for packages that
include assembly source files.
Change-Id: I64c490c55603609cf2cdbfae20ed787a581be4d3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/405734
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>