test: remove *_unified.go variants

CL 415241 and CL 411935 break tests into unified/nounified variants, for
compatibility with old frontend while developing unified IR. Now the old
frontend was gone, so moving those tests back to the original files.

Change-Id: Iecdcd4e6ee33c723f6ac02189b0be26248e15f0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/497275
Run-TryBot: Cuong Manh Le <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Auto-Submit: Cuong Manh Le <[email protected]>

Author: cuonglm

test/escape_iface.go

@@ -234,6 +234,16 @@ func dotTypeEscape2() { // #13805, #15796
 		*(&v) = x.(int)
 		*(&v), *(&ok) = y.(int)
 	}
+	{ // #13805, #15796
+		i := 0
+		j := 0
+		var ok bool
+		var x interface{} = i // ERROR "i does not escape"
+		var y interface{} = j // ERROR "j does not escape"
+
+		sink = x.(int)         // ERROR "x.\(int\) escapes to heap"
+		sink, *(&ok) = y.(int) // ERROR "autotmp_.* escapes to heap"
+	}
 	{
 		i := 0 // ERROR "moved to heap: i"
 		j := 0 // ERROR "moved to heap: j"

test/escape_iface_unified.go

@@ -110,6 +110,18 @@ func q(x int) int { // ERROR "can inline q"
 	return foo()                       // ERROR "inlining call to q.func1"
 }
 
+func r(z int) int {
+	foo := func(x int) int { // ERROR "can inline r.func1" "func literal does not escape"
+		return x + z
+	}
+	bar := func(x int) int { // ERROR "func literal does not escape" "can inline r.func2"
+		return x + func(y int) int { // ERROR "can inline r.func2.1" "can inline r.r.func2.func3"
+			return 2*y + x*z
+		}(x) // ERROR "inlining call to r.func2.1"
+	}
+	return foo(42) + bar(42) // ERROR "inlining call to r.func1" "inlining call to r.func2" "inlining call to r.r.func2.func3"
+}
+
 func s0(x int) int { // ERROR "can inline s0"
 	foo := func() { // ERROR "can inline s0.func1" "func literal does not escape"
 		x = x + 1