Contents of reachable statics is reachable

(cherry picked from commit 0383131)

Author: tmiasko

compiler/rustc_passes/src/reachable.rs

@@ -98,15 +98,11 @@ impl<'tcx> Visitor<'tcx> for ReachableContext<'tcx> {
                 self.worklist.push(def_id);
             } else {
                 match res {
-                    // If this path leads to a constant, then we need to
-                    // recurse into the constant to continue finding
-                    // items that are reachable.
-                    Res::Def(DefKind::Const | DefKind::AssocConst, _) => {
+                    // Reachable constants and reachable statics can have their contents inlined
+                    // into other crates. Mark them as reachable and recurse into their body.
+                    Res::Def(DefKind::Const | DefKind::AssocConst | DefKind::Static(_), _) => {
                         self.worklist.push(def_id);
                     }
-
-                    // If this wasn't a static, then the destination is
-                    // surely reachable.
                     _ => {
                         self.reachable_symbols.insert(def_id);
                     }

tests/ui/cross-crate/auxiliary/static_init_aux.rs

@@ -1,10 +1,14 @@
 pub static V: &u32 = &X;
 pub static F: fn() = f;
+pub static G: fn() = G0;
 
 static X: u32 = 42;
+static G0: fn() = g;
 
 pub fn v() -> *const u32 {
     V
 }
 
 fn f() {}
+
+fn g() {}

tests/ui/cross-crate/static-init.rs

@@ -1,9 +1,11 @@
+// Regression test for #84455 and #115052.
 // run-pass
 // aux-build:static_init_aux.rs
 extern crate static_init_aux as aux;
 
 static V: &u32 = aux::V;
 static F: fn() = aux::F;
+static G: fn() = aux::G;
 
 fn v() -> *const u32 {
     V
@@ -12,4 +14,5 @@ fn v() -> *const u32 {
 fn main() {
     assert_eq!(aux::v(), crate::v());
     F();
+    G();
 }