Merge pull request #11741 from ethereum/shadowing_inlineasm_fix_yul_codegen

Fixed inline assembly external identifier access.

test/libsolidity/semanticTests/inlineAssembly/external_identifier_access_shadowing.sol

@@ -0,0 +1,12 @@
+contract C {
+    function f() public returns (uint x) {
+        assembly {
+            function g() -> f { f := 2 }
+            x := g()
+        }
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// f() -> 2

test/libsolidity/syntaxTests/inlineAssembly/external_identifier_access_shadowing.sol

@@ -0,0 +1,12 @@
+contract C {
+    function f() public returns (uint x) {
+        assembly {
+            function g() -> x {
+                x := 42
+            }
+            x := g()
+        }
+    }
+}
+// ----
+// DeclarationError 6578: (123-124): Cannot access local Solidity variables from inside an inline assembly function.