Fix #2895: Generate bridges for inline methods

There was a test before that explicitly suppressed bridge generation
for inline methods. I am not sure why. @DarkDimius, does the one ring a bell?

Author: odersky

compiler/src/dotty/tools/dotc/transform/Bridges.scala

@@ -39,7 +39,6 @@ class Bridges(root: ClassSymbol)(implicit ctx: Context) {
    *  before erasure, if the following conditions are satisfied.
    *
    *   - `member` and other have different signatures
-   *   - `member` is not inline
    *   - there is not yet a bridge with the same name and signature in `root`
    *
    *  The bridge has the erased info of `other` and forwards to `member`.
@@ -48,7 +47,7 @@ class Bridges(root: ClassSymbol)(implicit ctx: Context) {
     def bridgeExists =
       bridgesScope.lookupAll(member.name).exists(bridge =>
         bridgeTarget(bridge) == member && bridge.signature == other.signature)
-    if (!(member.is(Inline) || member.signature == other.signature || bridgeExists))
+    if (!(member.signature == other.signature || bridgeExists))
       addBridge(member, other)
   }
 

tests/run/i2895.scala

@@ -0,0 +1,17 @@
+object Foo extends (Int => Int) {
+  inline def apply(x: Int): Int = impl(x)
+  def impl(x: Int): Int = x + 1
+}
+
+object Test {
+
+  def test(foo: Foo.type): Int = foo(41)
+
+  def test2(f: Int => Int): Int = f(41)
+
+  def main(args: Array[String]): Unit = {
+    assert(test(Foo) == 42)
+    assert(test2(Foo) == 42)
+  }
+
+}