test/codegen: check zerobase for newobject on 0-sized types

This CL also adds riscv64 checks

Change-Id: I693e4e606f470615f6b49085592d6d5ca61473d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/703716
Reviewed-by: Pengcheng Wang <[email protected]>
Auto-Submit: Keith Randall <[email protected]>
Reviewed-by: Mark Freeman <[email protected]>
Reviewed-by: Joel Sing <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Keith Randall <[email protected]>

Author: mengzhuo

test/codegen/alloc.go

@@ -10,25 +10,28 @@
 package codegen
 
 func zeroAllocNew1() *struct{} {
-	// 386:-`CALL\truntime\.newobject`
-	// amd64:-`CALL\truntime\.newobject`
-	// arm:-`CALL\truntime\.newobject`
-	// arm64:-`CALL\truntime\.newobject`
+	// 386:-`CALL\truntime\.newobject`, `LEAL\truntime.zerobase`
+	// amd64:-`CALL\truntime\.newobject`, `LEAQ\truntime.zerobase`
+	// arm:-`CALL\truntime\.newobject`, `MOVW\t[$]runtime.zerobase`
+	// arm64:-`CALL\truntime\.newobject`, `MOVD\t[$]runtime.zerobase`
+	// riscv64:-`CALL\truntime\.newobject`, `MOV\t[$]runtime.zerobase`
 	return new(struct{})
 }
 
 func zeroAllocNew2() *[0]int {
-	// 386:-`CALL\truntime\.newobject`
-	// amd64:-`CALL\truntime\.newobject`
-	// arm:-`CALL\truntime\.newobject`
-	// arm64:-`CALL\truntime\.newobject`
+	// 386:-`CALL\truntime\.newobject`, `LEAL\truntime.zerobase`
+	// amd64:-`CALL\truntime\.newobject`, `LEAQ\truntime.zerobase`
+	// arm:-`CALL\truntime\.newobject`, `MOVW\t[$]runtime.zerobase`
+	// arm64:-`CALL\truntime\.newobject`, `MOVD\t[$]runtime.zerobase`
+	// riscv64:-`CALL\truntime\.newobject`, `MOV\t[$]runtime.zerobase`
 	return new([0]int)
 }
 
 func zeroAllocSliceLit() []int {
-	// 386:-`CALL\truntime\.newobject`
-	// amd64:-`CALL\truntime\.newobject`
-	// arm:-`CALL\truntime\.newobject`
-	// arm64:-`CALL\truntime\.newobject`
+	// 386:-`CALL\truntime\.newobject`, `LEAL\truntime.zerobase`
+	// amd64:-`CALL\truntime\.newobject`, `LEAQ\truntime.zerobase`
+	// arm:-`CALL\truntime\.newobject`, `MOVW\t[$]runtime.zerobase`
+	// arm64:-`CALL\truntime\.newobject`, `MOVD\t[$]runtime.zerobase`
+	// riscv64:-`CALL\truntime\.newobject`, `MOV\t[$]runtime.zerobase`
 	return []int{}
 }