Merge pull request #9135 from ethereum/fixReturnParameterLocation

Fixing ICE on calling externally a function that returns calldata pointers

test/libsolidity/semanticTests/calldata/calldata_bytes_external.sol

@@ -0,0 +1,12 @@
+contract CalldataTest {
+    function test(bytes calldata x) public returns (bytes calldata) {
+        return x;
+    }
+    function tester(bytes calldata x) public returns (byte) {
+        return this.test(x)[2];
+    }
+}
+// ====
+// EVMVersion: >=byzantium
+// ----
+// tester(bytes): 0x20, 0x08, "abcdefgh" -> "c"