cmd/compile: remove go:wasmimport restriction

Removes the package restriction on go:wasmimport, allowing the
use of it globally and in user code.

Fixes #59149

Change-Id: Ib26f628dc8dafb31388005b50449e91b47dab447
Reviewed-on: https://go-review.googlesource.com/c/go/+/489255
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Eli Bendersky <eliben@google.com>
Auto-Submit: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

src/cmd/compile/internal/noder/noder.go

@@ -237,10 +237,6 @@ func (p *noder) pragma(pos syntax.Pos, blankLine bool, text string, old syntax.P
 			p.error(syntax.Error{Pos: pos, Msg: "usage: //go:wasmimport importmodule importname"})
 			break
 		}
-		if !base.Flag.CompilingRuntime && base.Ctxt.Pkgpath != "syscall/js" && base.Ctxt.Pkgpath != "syscall/js_test" && base.Ctxt.Pkgpath != "syscall" {
-			p.error(syntax.Error{Pos: pos, Msg: "//go:wasmimport directive cannot be used outside of runtime or syscall/js"})
-			break
-		}
 
 		if buildcfg.GOARCH == "wasm" {
 			// Only actually use them if we're compiling to WASM though.