compiler: make map and channel panics recoverable

Change hashmap set operations and channel send/close from
createRuntimeCall to createRuntimeInvoke. This places a setjmp
checkpoint before each call, allowing runtimePanicAt to safely
longjmp when these operations panic.

testdata/recover.go

@@ -41,6 +41,9 @@ func main() {
 
 	println("\n# recover runtime errors")
 	recoverRuntimeError()
+
+	println("\n# recover from nil map and closed channel")
+	recoverNilMapAndChan()
 }
 
 func recoverSimple() {
@@ -241,3 +244,20 @@ func recoverMustPanic(name string, f func()) {
 	}()
 	f()
 }
+
+// Test recovering from nil map assignment and closed channel send.
+func recoverNilMapAndChan() {
+	recoverMustPanic("nil map", func() {
+		var m map[string]int
+		m["x"] = 1
+	})
+	recoverMustPanic("closed chan", func() {
+		ch := make(chan int)
+		close(ch)
+		ch <- 1
+	})
+	recoverMustPanic("close nil chan", func() {
+		var ch chan int
+		close(ch)
+	})
+}

testdata/recover.txt

@@ -44,3 +44,8 @@ outer recovered: repanic value
   recovered: slice
   recovered: type assert
   recovered: empty interface type assert
+
+# recover from nil map and closed channel
+  recovered: nil map
+  recovered: closed chan
+  recovered: close nil chan