Fix semicolon_outside_block suggests wrongly when inside macros (#14954)

Closes rust-lang/rust-clippy#14926

changelog: [`semicolon_outside_block`] fix wrong suggestions when inside
macros

Author: samueltardieu

clippy_lints/src/semicolon_block.rs

@@ -143,7 +143,7 @@ impl LateLintPass<'_> for SemicolonBlock {
             StmtKind::Expr(Expr {
                 kind: ExprKind::Block(block, _),
                 ..
-            }) if !block.span.from_expansion() => {
+            }) if !block.span.from_expansion() && stmt.span.contains(block.span) => {
                 let Block {
                     expr: None,
                     stmts: [.., stmt],

tests/ui/semicolon_outside_block.fixed

@@ -96,3 +96,28 @@ fn main() {
 
     unit_fn_block()
 }
+
+fn issue14926() {
+    macro_rules! gen_code {
+        [$l:lifetime: $b:block, $b2: block $(,)?] => {
+            $l: loop {
+                $b
+                break $l;
+            }
+            $l: loop {
+                $b2
+                break $l;
+            }
+        };
+    }
+
+    gen_code! {
+        'root:
+        {
+            println!("Block1");
+        },
+        {
+            println!("Block2");
+        },
+    }
+}

tests/ui/semicolon_outside_block.rs

@@ -96,3 +96,28 @@ fn main() {
 
     unit_fn_block()
 }
+
+fn issue14926() {
+    macro_rules! gen_code {
+        [$l:lifetime: $b:block, $b2: block $(,)?] => {
+            $l: loop {
+                $b
+                break $l;
+            }
+            $l: loop {
+                $b2
+                break $l;
+            }
+        };
+    }
+
+    gen_code! {
+        'root:
+        {
+            println!("Block1");
+        },
+        {
+            println!("Block2");
+        },
+    }
+}