cmd/compile: allow inlining of functions with intrinsics in them

Intrinsics are ok to inline as they don't rewrite to actual calls.

Change-Id: Ieb19c834c61579823c62c6d1a1b425d6c4d4de23
Reviewed-on: https://go-review.googlesource.com/34272
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

src/cmd/compile/internal/gc/inl.go

@@ -204,6 +204,10 @@ func ishairy(n *Node, budget *int32, reason *string) bool {
 			*budget -= fn.InlCost
 			break
 		}
+		if isIntrinsicCall(n) {
+			*budget--
+			break
+		}
 
 		if n.isMethodCalledAsFunction() {
 			if d := n.Left.Sym.Def; d != nil && d.Func.Inl.Len() != 0 {