Fix inlining of CFuncs with reloop locals (#7132)

The recent V3InlineCFuncs only checks AstCFunc::varsp for locals, but
V3Reloop used to insert them into AstCFunc::stmtsp resulting in multiple
locals with the same name being inlined into the caller if the stars
align. Fix Reloop. Such things will also go away with #6280.

src/V3Reloop.cpp

@@ -68,6 +68,7 @@ class ReloopVisitor final : public VNVisitor {
         const string newvarname{"__Vilp" + std::to_string(cfuncp->user1Inc() + 1)};
         AstVar* const varp
             = new AstVar{fl, VVarType::STMTTEMP, newvarname, VFlagLogicPacked{}, 32};
+        cfuncp->addVarsp(varp);
         return varp;
     }
     void mergeEnd() {
@@ -105,8 +106,7 @@ class ReloopVisitor final : public VNVisitor {
                 AstLoop* const loopp = new AstLoop{fl};
                 loopp->addStmtsp(new AstLoopTest{fl, loopp, condp});
                 initp->addNext(loopp);
-                itp->AstNode::addNext(initp);
-                bodyp->replaceWith(itp);
+                bodyp->replaceWith(initp);
                 loopp->addStmtsp(bodyp);
                 loopp->addStmtsp(incp);
 

test_regress/t/t_reloop_inlined.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of either the GNU Lesser General Public License Version 3
+# or the Perl Artistic License Version 2.0.
+# SPDX-FileCopyrightText: 2026 Wilson Snyder
+# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
+
+import vltest_bootstrap
+
+test.scenarios('vlt')
+
+test.compile(verilator_flags2=[
+    "--binary", "--unroll-count", "1024", "--inline-cfuncs", "100000000", "--output-split-cfuncs",
+    "50", "--reloop-limit", "2"
+])
+
+test.execute()
+
+test.passes()

test_regress/t/t_reloop_inlined.v

@@ -0,0 +1,43 @@
+// DESCRIPTION: Verilator: Verilog Test module
+//
+// This file ONLY is placed under the Creative Commons Public Domain.
+// SPDX-FileCopyrightText: 2026 Wilson Snyder
+// SPDX-License-Identifier: CC0-1.0
+
+module t;
+  bit clk1 = 1'b0;
+  bit clk2 = 1'b0;
+  always #5 clk1 = ~clk1;
+  always #10 clk2 = ~clk2;
+
+  int iarray [63:0];
+  int oarray1 [63:0];
+  int oarray2 [63:0];
+
+  initial begin
+    for (int i = 0; i < 64 ; i = i + 1) begin
+      iarray[i] = i;
+    end
+
+    #100;
+
+    for (int i = 0; i < 64; i = i + 1) begin
+      $display("%d %d %d", i, oarray1[i], oarray2[i]);
+    end
+
+    $write("*-* All Finished *-*\n");
+    $finish;
+  end
+
+  always @(posedge clk1) begin
+    for (int i = 0; i < 64 ; i = i + 1) begin
+      oarray1[i] = iarray[i];
+    end
+  end
+  always @(posedge clk2) begin
+    for (int i = 0; i < 64 ; i = i + 1) begin
+      oarray2[i] =iarray[i];
+    end
+  end
+
+endmodule