[SILGen] Make sure profile increments gets assigned the correct scope.

<rdar://problem/46686369>

Author: Davide Italiano

lib/SILGen/SILGenStmt.cpp

@@ -680,8 +680,8 @@ void StmtEmitter::visitGuardStmt(GuardStmt *S) {
     // Note that we don't push break/continue locations since they aren't valid
     // in this statement.
     SILGenSavedInsertionPoint savedIP(SGF, bodyBB.getBlock());
-    SGF.emitProfilerIncrement(S->getBody());
     SGF.emitStmt(S->getBody());
+    SGF.emitProfilerIncrement(S->getBody());
 
     // The body block must end in a noreturn call, return, break etc.  It
     // isn't valid to fall off into the normal flow.  To model this, we emit

test/SILOptimizer/profile_debugscope.swift

@@ -0,0 +1,20 @@
+// RUN: %target-swift-frontend -Onone -emit-silgen -profile-generate \
+// RUN:   -sil-verify-all -Xllvm -sil-print-debuginfo %s | %FileCheck %s
+
+// <rdar://problem/46686369>
+// REQUIRES: objc_interop
+
+// CHECK: bb4:
+// CHECK: integer_literal $Builtin.Int64, 0, loc "{{.*}}":18:10, scope 2
+// CHECK-NEXT:  integer_literal $Builtin.Int32, 2, loc "{{.*}}":18:10, scope 2
+// CHECK-NEXT:  integer_literal $Builtin.Int32, 1, loc "{{.*}}":18:10, scope 2
+// CHECK-NEXT:  builtin "int_instrprof_increment"(%31 : $Builtin.RawPointer, %32 : $Builtin.Int64, %33 : $Builtin.Int32, %34 : $Builtin.Int32) : $(), loc "{{.*}}":18:10, scope 2
+// CHECK-NEXT:  unreachable , loc "{{.*}}":16:1, scope 2
+
+
+import Foundation
+guard let patatino: URL = {
+    return nil
+}() else {
+    exit(0)
+}