cmd/compile: fix defer/deferreturn

Make sure we do any just-before-return cleanup on all paths out of a
function, including when recovering.  Each exit path should include
deferreturn (if there are any defers) and then the exit
code (e.g. copying heap-escaping return values back to the stack).

Introduce a Defer SSA block type which has two outgoing edges - one the
fallthrough edge (the defer was queued successfully) and one which
immediately returns (the defer had a successful recover() call and
normal execution should resume at the return point).

Fixes #14725

Change-Id: Iad035c9fd25ef8b7a74dafbd7461cf04833d981f
Reviewed-on: https://go-review.googlesource.com/20486
Reviewed-by: David Chase <drchase@google.com>

src/cmd/compile/internal/ssa/gen/genericOps.go

@@ -401,6 +401,7 @@ var genericBlocks = []blockData{
 	{name: "Plain"},  // a single successor
 	{name: "If"},     // 2 successors, if control goto Succs[0] else goto Succs[1]
 	{name: "Call"},   // 1 successor, control is call op (of memory type)
+	{name: "Defer"},  // 2 successors, Succs[0]=defer queued, Succs[1]=defer recovered. control is call op (of memory type)
 	{name: "Check"},  // 1 successor, control is nilcheck op (of void type)
 	{name: "Ret"},    // no successors, control value is memory result
 	{name: "RetJmp"}, // no successors, jumps to b.Aux.(*gc.Sym)