Allow builtins in yul identifier paths in antlr grammar.

Changelog.md

@@ -10,6 +10,7 @@ Compiler Features:
 
 
 Bugfixes:
+ * Antlr Grammar: Allow builtin names in ``yulPath`` to support ``.address`` in function pointers.
  * Control Flow Graph: Perform proper virtual lookup for modifiers for uninitialized variable and unreachable code analysis.
  * Immutables: Fix wrong error when the constructor of a base contract uses ``return`` and the parent contract contains immutable variables.
 

docs/grammar/SolidityParser.g4

@@ -564,7 +564,7 @@ yulFunctionDefinition:
  * While only identifiers without dots can be declared within inline assembly,
  * paths containing dots can refer to declarations outside the inline assembly block.
  */
-yulPath: YulIdentifier (YulPeriod YulIdentifier)*;
+yulPath: YulIdentifier (YulPeriod (YulIdentifier | YulEVMBuiltin))*;
 /**
  * A call to a function with return values can only occur as right-hand side of an assignment or
  * a variable declaration.

test/libsolidity/syntaxTests/inlineAssembly/assignment_to_function_pointer.sol

@@ -0,0 +1,9 @@
+contract C {
+  function f() public pure {
+    function() external g;
+    assembly {
+      g.address := 0x42
+      g.selector := 0x23
+    }
+  }
+}