[dev.typeparams] cmd/compile: fix small -G=3 issues for tests disabled in run.go

- set correct position for closure capture variable in (*irgen).use()
   (issue20250.go) Also, evaluate rhs, lhs in that order in assignment
   statements to match noder1 (affects ordering of closure variables).

 - make sure to set Assign flag properly in (*irgen).forStmt() for range
   variables which are map accesses (issue9691.go)

 - make sure CheckSize() is call on the base type for top-level types
   converted by (*irgen).typ() that are pointer types (issue20174.go and
   issue37837.go)

 - deal with parentheses properly in validation function
   (*irgen).validate() (issue17270.go)

 - avoid HasNil call on type TTYPEPARAM - types2 typechecker will have
   already checked validity of the typeparam having nil value (new test
   issue39755.go)

Change-Id: Ie68004d964698aea047e19e7dcd79b297e9d47ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/334733
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

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

@@ -29,7 +29,7 @@ func (g *irgen) use(name *syntax.Name) *ir.Name {
 	if !ok {
 		base.FatalfAt(g.pos(name), "unknown name %v", name)
 	}
-	obj := ir.CaptureName(g.pos(obj2), ir.CurFunc, g.obj(obj2))
+	obj := ir.CaptureName(g.pos(name), ir.CurFunc, g.obj(obj2))
 	if obj.Defn != nil && obj.Defn.Op() == ir.ONAME {
 		// If CaptureName created a closure variable, then transfer the
 		// type of the captured name to the new closure variable.