Merge pull request #10677 from ethereum/dirtyMemoryBytesSol2Yul

[Sol->Yul] Disable old codegen test viaYul and create new one that fits IR semantics

test/libsolidity/semanticTests/array/copying/dirty_memory_bytes_to_storage_copy.sol

@@ -12,5 +12,7 @@ contract C {
         }
     }
 }
+// ====
+// compileViaYul: false
 // ----
 // f() -> 0x6465616462656566313564656164000000000000000000000000000000000010

test/libsolidity/semanticTests/array/copying/dirty_memory_bytes_to_storage_copy_ir.sol

@@ -0,0 +1,18 @@
+contract C {
+    bytes x;
+    function f() public returns (uint r) {
+        bytes memory m = "tmp";
+        assembly {
+            mstore(m, 8)
+            mstore(add(m, 32), "deadbeef15dead")
+        }
+        x = m;
+        assembly {
+            r := sload(x.slot)
+        }
+    }
+}
+// ====
+// compileViaYul: true
+// ----
+// f() -> 0x6465616462656566000000000000000000000000000000000000000000000010