Update tests after rebase

Author: oli-obk

src/test/mir-opt/const_prop/large_array_index/32bit/rustc.main.ConstProp.diff renamed to src/test/mir-opt/const_prop/large_array_index.main.ConstProp.diff.32bit

@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR large_array_index.main.ConstProp.diff
 fn main() {
     // check that we don't propagate this, because it's too large
     let x: u8 = [0_u8; 5000][2];