[dev.typeparams] runtime: replace funcPC with internal/abi.FuncPCABIInternal

At this point all funcPC references are ABIInternal functions.
Replace with the intrinsics.

Change-Id: I3ba7e485c83017408749b53f92877d3727a75e27
Reviewed-on: https://go-review.googlesource.com/c/go/+/321954
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>
diff --git a/src/runtime/preempt.go b/src/runtime/preempt.go
index d1291c9..d6cdf1b 100644
--- a/src/runtime/preempt.go
+++ b/src/runtime/preempt.go
@@ -318,7 +318,7 @@
 func init() {
 	f := findfunc(abi.FuncPCABI0(asyncPreempt))
 	total := funcMaxSPDelta(f)
-	f = findfunc(funcPC(asyncPreempt2))
+	f = findfunc(abi.FuncPCABIInternal(asyncPreempt2))
 	total += funcMaxSPDelta(f)
 	// Add some overhead for return PCs, etc.
 	asyncPreemptStack = uintptr(total) + 8*sys.PtrSize