-i: Exclude ldc.* modules by default

dmd/compiler.d

@@ -323,10 +323,11 @@ private void createMatchNodes()
         }
 
         // Add the default 1 depth matchers
-        MatcherNode[8] defaultDepth1MatchNodes = [
+        MatcherNode[10] defaultDepth1MatchNodes = [
             MatcherNode(true, 1), MatcherNode(Id.std),
             MatcherNode(true, 1), MatcherNode(Id.core),
             MatcherNode(true, 1), MatcherNode(Id.etc),
+            MatcherNode(true, 1), MatcherNode(Id.ldc), // IN_LLVM
             MatcherNode(true, 1), MatcherNode(Id.object),
         ];
         {

tests/driver/include_imports.d

@@ -0,0 +1,29 @@
+// Make sure that -i includes an imported custom module, but excludes
+// druntime and Phobos modules.
+
+// Make sure it links and check the -v output:
+// RUN: %ldc -I%S -i %s -v | FileCheck %s
+
+// CHECK-NOT: {{^code .*}}
+// CHECK:     {{^code include_imports2}}
+// CHECK-NOT: {{^code .*}}
+// CHECK:     {{^code include_imports}}
+// CHECK-NOT: {{^code .*}}
+
+static import core.stdc.math;       // druntime
+static import std.math;             // Phobos
+import ldc.attributes : assumeUsed; // LDC-specific druntime
+import inputs.include_imports2 : bar;
+
+@assumeUsed
+void test(string s, double x)
+{
+    const r1 = core.stdc.math.log(x);
+    const r2 = std.math.log(x);
+    bar();
+}
+
+void main()
+{
+    test("abc", 0.5);
+}

tests/driver/inputs/include_imports2.d

@@ -0,0 +1 @@
+void bar() {}