Swift: Fix CFG for 'foreach' statements.

Author: MathiasVP

swift/ql/lib/codeql/swift/controlflow/internal/ControlFlowGraphImpl.qll

@@ -476,7 +476,7 @@ module Stmts {
         or
         // Flow from last element of variable declaration ...
         astLast(ast.getPattern().getFullyUnresolved(), pred, c) and
-        c instanceof SimpleCompletion and
+        c instanceof NormalCompletion and
         (
           // ... to first element of loop body if no 'where' clause exists,
           astFirst(ast.getBody(), succ) and

swift/ql/test/library-tests/controlflow/graph/Cfg.expected

@@ -1245,6 +1245,7 @@ cfg.swift:
 #-----| empty -> switch x { ... }
 
 #  138| _
+#-----| no-match -> { ... }
 
 #  138| 0
 #-----|  -> 10
@@ -1265,6 +1266,9 @@ cfg.swift:
 #  138| 10
 #-----|  -> ... call to ... ...
 
+#  138| { ... }
+#-----|  -> for ... in ... { ... }
+
 #  140| switch x { ... }
 #-----|  -> x