[dev.link] ensure package path is set when TEXT symbols are created

We're reworking pclntab generation in the linker, and with that we're
moving FuncID generation in to the compiler. Determining the FuncID is
done by a lookup on the package.function name; therefore, we need the
package whenever we make the TEXT symbols.

Change-Id: I805445ffbf2f895f06ce3a91fb09126d012bf86e
Reviewed-on: https://go-review.googlesource.com/c/go/+/245318


Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/compile/internal/gc/main.go

@@ -285,6 +285,8 @@ func Main(archInit func(*Arch)) {
 
 	objabi.Flagparse(usage)
 
+	Ctxt.Pkgpath = myimportpath
+
 	for _, f := range strings.Split(spectre, ",") {
 		f = strings.TrimSpace(f)
 		switch f {
@@ -789,7 +791,6 @@ func Main(archInit func(*Arch)) {
 	// Write object data to disk.
 	timings.Start("be", "dumpobj")
 	dumpdata()
-	Ctxt.Pkgpath = myimportpath
 	Ctxt.NumberSyms()
 	dumpobj()
 	if asmhdr != "" {

src/cmd/dist/build.go

@@ -824,6 +824,7 @@ func runInstall(pkg string, ch chan struct{}) {
 		"-D", "GOOS_" + goos,
 		"-D", "GOARCH_" + goarch,
 		"-D", "GOOS_GOARCH_" + goos + "_" + goarch,
+		"-p", pkg,
 	}
 	if goarch == "mips" || goarch == "mipsle" {
 		// Define GOMIPS_value from gomips.