Debug information for immutable references.

test/cmdlineTests/standard_immutable_references/input.json

@@ -0,0 +1,18 @@
+{
+ "language": "Solidity",
+ "sources": {
+  "a.sol": {
+   "content": "contract A { uint256 immutable x = 1; function f() public view returns (uint256) { return x; } }"
+  }
+ },
+ "settings": {
+  "evmVersion": "petersburg",
+  "outputSelection": {
+   "*": {
+    "A": [
+     "evm.deployedBytecode.immutableReferences"
+    ]
+   }
+  }
+ }
+}

test/cmdlineTests/standard_immutable_references/output.json

@@ -0,0 +1,2 @@
+{"contracts":{"a.sol":{"A":{"evm":{"deployedBytecode":{"immutableReferences":{"3":[[77,32]]},"linkReferences":{},"object":"bytecode removed","opcodes":"opcodes removed","sourceMap":"0:96:0:-:0;;;;5:9:-1;2:2;;;27:1;24;17:12;2:2;0:96:0;;;;;;;;;;;;;;;;12:1:-1;9;2:12;38:56:0;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;72:7;90:1;83:8;;38:56;:::o"}}}}},"errors":[{"component":"general","formattedMessage":"a.sol: Warning: Source file does not specify required compiler version!
+","message":"Source file does not specify required compiler version!","severity":"warning","sourceLocation":{"end":-1,"file":"a.sol","start":-1},"type":"Warning"}],"sources":{"a.sol":{"id":0}}}