Rollup merge of #52915 - Zoxc:refine-gen-borrow-analysis, r=eddyb

Don't count MIR locals as borrowed after StorageDead when finding locals live across a yield terminator

This should fix https://github.com/rust-lang/rust/issues/52792.

r? @eddyb

src/test/run-pass/generator/yield-in-initializer.rs

@@ -0,0 +1,25 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(generators)]
+
+fn main() {
+    static || {
+        loop {
+            // Test that `opt` is not live across the yield, even when borrowed in a loop
+            // See https://github.com/rust-lang/rust/issues/52792
+            let opt = {
+                yield;
+                true
+            };
+            &opt;
+        }
+    };
+}