Auto merge of #82884 - nagisa:nagisa/remove-most-of-sideeffect-inserts, r=nikic

Remove the -Zinsert-sideeffect

This removes all of the code we had in place to work-around LLVM's
handling of forward progress. From this removal excluded is a workaround
where we'd insert a `sideeffect` into clearly infinite loops such as
`loop {}`. This code remains conditionally effective when the LLVM
version is earlier than 12.0, which fixed the forward progress related
miscompilations at their root.

1 files changed, 0 insertions, 15 deletions

diff --git a/src/test/codegen/loop.rs b/src/test/codegen/loop.rs
deleted file mode 100644
index e54298eed05..00000000000
--- a/src/test/codegen/loop.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// compile-flags: -C opt-level=3
-
-#![crate_type = "lib"]
-
-// CHECK-LABEL: @check_loop
-#[no_mangle]
-pub fn check_loop() -> u8 {
-    // CHECK-NOT: unreachable
-    call_looper()
-}
-
-#[no_mangle]
-fn call_looper() -> ! {
-    loop {}
-}