Fix translation error in binding of binary expressions (microsoft#1768)

Author: ahejlsberg

internal/binder/binder.go

@@ -2243,12 +2243,12 @@ func (b *Binder) bindBinaryExpressionFlow(node *ast.Node) {
 		b.bind(expr.Left)
 		b.bind(expr.Type)
 		if operator == ast.KindCommaToken {
-			b.maybeBindExpressionFlowIfCall(node)
+			b.maybeBindExpressionFlowIfCall(expr.Left)
 		}
 		b.bind(expr.OperatorToken)
 		b.bind(expr.Right)
 		if operator == ast.KindCommaToken {
-			b.maybeBindExpressionFlowIfCall(node)
+			b.maybeBindExpressionFlowIfCall(expr.Right)
 		}
 		if ast.IsAssignmentOperator(operator) && !ast.IsAssignmentTarget(node) {
 			b.bindAssignmentTargetFlow(expr.Left)

testdata/baselines/reference/submodule/compiler/controlFlowCommaExpressionAssertionMultiple.types

@@ -20,10 +20,10 @@ function func(foo: any, bar: any) {
 >bar : any
 
     foo;
->foo : any
+>foo : number
 
     bar;
->bar : any
+>bar : string
 }
 
 function func2(foo: any, bar: any, baz: any) {
@@ -46,12 +46,12 @@ function func2(foo: any, bar: any, baz: any) {
 >baz : any
 
     foo;
->foo : any
+>foo : number
 
     bar;
->bar : any
+>bar : string
 
     baz;
->baz : any
+>baz : boolean
 }