[dev.typeparams] cmd/compile, runtime: remove the siz argument of newproc/deferproc

newproc/deferproc takes a siz argument for the go'd/deferred
function's argument size. Now it is always zero. Remove the
argument.

Change-Id: If1bb8d427e34015ccec0ba10dbccaae96757fa8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/325917
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

src/runtime/panic.go

@@ -224,21 +224,16 @@ func panicmemAddr(addr uintptr) {
 	panic(errorAddressString{msg: "invalid memory address or nil pointer dereference", addr: addr})
 }
 
-// Create a new deferred function fn with siz bytes of arguments.
+// Create a new deferred function fn, which has no arguments and results.
 // The compiler turns a defer statement into a call to this.
 //go:nosplit
-func deferproc(siz int32, fn *funcval) { // arguments of fn follow fn
+func deferproc(fn *funcval) { // TODO: Make deferproc just take a func().
 	gp := getg()
 	if gp.m.curg != gp {
 		// go code on the system stack can't defer
 		throw("defer on system stack")
 	}
 
-	if siz != 0 {
-		// TODO: Make deferproc just take a func().
-		throw("defer with non-empty frame")
-	}
-
 	// the arguments of fn are in a perilous state. The stack map
 	// for deferproc does not describe them. So we can't let garbage
 	// collection or stack copying trigger until we've copied them out