Auto merge of #127906 - tgross35:rollup-41bhgce, r=tgross35

Rollup of 7 pull requests

Successful merges:

 - #127491 (Migrate 8 very similar FFI `run-make` tests to rmake)
 - #127687 (Const-to-pattern-to-MIR cleanup)
 - #127822 (Migrate `issue-85401-static-mir`, `missing-crate-dependency` and `unstable-flag-required` `run-make` tests to rmake)
 - #127842 (Remove `TrailingToken`.)
 - #127864 (cleanup: remove support for 3DNow! cpu features)
 - #127899 (Mark myself as on leave)
 - #127901 (Add missing GHA group for building `llvm-bitcode-linker`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Cargo.lock

@@ -4411,6 +4411,7 @@ dependencies = [
 name = "rustc_mir_build"
 version = "0.0.0"
 dependencies = [
+ "either",
  "itertools",
  "rustc_apfloat",
  "rustc_arena",

compiler/rustc_codegen_ssa/src/mir/constant.rs

@@ -37,13 +37,13 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     pub fn eval_unevaluated_mir_constant_to_valtree(
         &self,
         constant: &mir::ConstOperand<'tcx>,
-    ) -> Result<Option<ty::ValTree<'tcx>>, ErrorHandled> {
+    ) -> Result<Result<ty::ValTree<'tcx>, Ty<'tcx>>, ErrorHandled> {
         let uv = match self.monomorphize(constant.const_) {
             mir::Const::Unevaluated(uv, _) => uv.shrink(),
             mir::Const::Ty(_, c) => match c.kind() {
                 // A constant that came from a const generic but was then used as an argument to old-style
                 // simd_shuffle (passing as argument instead of as a generic param).
-                rustc_type_ir::ConstKind::Value(_, valtree) => return Ok(Some(valtree)),
+                rustc_type_ir::ConstKind::Value(_, valtree) => return Ok(Ok(valtree)),
                 other => span_bug!(constant.span, "{other:#?}"),
             },
             // We should never encounter `Const::Val` unless MIR opts (like const prop) evaluate
@@ -70,6 +70,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
         let val = self
             .eval_unevaluated_mir_constant_to_valtree(constant)
             .ok()
+            .map(|x| x.ok())
             .flatten()
             .map(|val| {
                 let field_ty = ty.builtin_index().unwrap();