Rollup merge of #61526 - lcnr:test_reorder, r=nikomatsakis

move some tests into subfolders

This reduces the size of the test folders without making the moved tests harder to find.

Is this kind of change desired/worth the effort?

src/test/codegen/intrinsics/exact_div.rs

@@ -8,13 +8,13 @@ use std::intrinsics::exact_div;
 // CHECK-LABEL: @exact_sdiv
 #[no_mangle]
 pub unsafe fn exact_sdiv(x: i32, y: i32) -> i32 {
-// CHECK: sdiv exact
+    // CHECK: sdiv exact
     exact_div(x, y)
 }
 
 // CHECK-LABEL: @exact_udiv
 #[no_mangle]
 pub unsafe fn exact_udiv(x: u32, y: u32) -> u32 {
-// CHECK: udiv exact
+    // CHECK: udiv exact
     exact_div(x, y)
 }