reflect: use direct calls to runtime string functions

The runtime.stringFromBytesTyped and runtime.stringToBytesTyped
functions aren't really necessary, because they have the same LLVM IR
signature. Therefore, remove them and link directly to the functions
that the compiler uses internally.

src/reflect/value.go

@@ -1209,7 +1209,7 @@ func cvtFloat(v Value, t *rawType) Value {
 	return makeFloat(v.flags, v.Float(), t)
 }
 
-//go:linkname stringToBytes runtime.stringToBytesTyped
+//go:linkname stringToBytes runtime.stringToBytes
 func stringToBytes(x string) []byte
 
 func cvtStringBytes(v Value, t *rawType) Value {
@@ -1221,7 +1221,7 @@ func cvtStringBytes(v Value, t *rawType) Value {
 	}
 }
 
-//go:linkname stringFromBytes runtime.stringFromBytesTyped
+//go:linkname stringFromBytes runtime.stringFromBytes
 func stringFromBytes(x []byte) string
 
 func cvtBytesString(v Value, t *rawType) Value {

src/runtime/string.go

@@ -77,16 +77,6 @@ func stringFromBytes(x struct {
 	return _string{ptr: (*byte)(buf), length: x.len}
 }
 
-func stringFromBytesTyped(x []byte) string {
-	slice := *(*struct {
-		ptr *byte
-		len uintptr
-		cap uintptr
-	})(unsafe.Pointer(&x))
-	s := stringFromBytes(slice)
-	return *(*string)(unsafe.Pointer(&s))
-}
-
 // Convert a string to a []byte slice.
 func stringToBytes(x _string) (slice struct {
 	ptr *byte
@@ -101,12 +91,6 @@ func stringToBytes(x _string) (slice struct {
 	return
 }
 
-func stringToBytesTyped(x string) []byte {
-	s := *(*_string)(unsafe.Pointer(&x))
-	slice := stringToBytes(s)
-	return *(*[]byte)(unsafe.Pointer(&slice))
-}
-
 // Convert a []rune slice to a string.
 func stringFromRunes(runeSlice []rune) (s _string) {
 	// Count the number of characters that will be in the string.