Look for experimental pragmas in the module containing the definition when generating code for modifiers and inherited functions

test/libsolidity/syntaxTests/abiEncoder/v1_v2_v1_modifier_mix.sol

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+==== Source: C ====
+import "X";
+import "V1A";
+import "V2A";
+import "V1B";
+
+contract C is V1A, V2A, V1B {
+    function foo()
+        public
+        modV1A
+        modV2A // There should be no error for modV2A (it uses ABIEncoderV2)
+        modV1B
+    {
+    }
+}
+==== Source: V1A ====
+import "X";
+
+contract V1A {
+    modifier modV1A() {
+        _;
+    }
+}
+==== Source: V1B ====
+import "X";
+
+contract V1B {
+    modifier modV1B() {
+        _;
+    }
+}
+==== Source: V2A ====
+pragma experimental ABIEncoderV2;
+import "X";
+
+contract V2A {
+    modifier modV2A() {
+        X(0x00).get();
+        _;
+    }
+}
+==== Source: X ====
+pragma experimental ABIEncoderV2;
+
+struct Data {
+    bool flag;
+}
+
+contract X {
+    function get() public view returns (Data memory) {}
+}
+// ----