Auto merge of #70721 - anyska:bless-all-mir-opt, r=oli-obk

--bless all mir-opt tests.

r? @oli-obk

src/test/mir-opt/README.md

@@ -1,9 +1,7 @@
 This folder contains tests for MIR optimizations.
 
-There are two test formats. One allows specifying a pattern to look for in the MIR, which also
-permits leaving placeholders, but requires you to manually change the pattern if anything changes.
-The other emits MIR to extra files that you can automatically update by specifying `--bless` on
-the command line (just like `ui` tests updating `.stderr` files).
+The `mir-opt` test format emits MIR to extra files that you can automatically update by specifying
+`--bless` on the command line (just like `ui` tests updating `.stderr` files).
 
 # `--bless`able test format
 
@@ -39,79 +37,3 @@ This exists mainly for completeness and is rarely useful.
 ```
 // EMIT_MIR $file_name_of_some_mir_dump.before.mir
 ```
-
-# Inline test format
-
-```
-(arbitrary rust code)
-// END RUST SOURCE
-// START $file_name_of_some_mir_dump_0
-//  $expected_line_0
-// (lines or elision)
-// $expected_line_N
-// END $file_name_of_some_mir_dump_0
-// (lines or elision)
-// START $file_name_of_some_mir_dump_N
-//  $expected_line_0
-// (lines or elision)
-// $expected_line_N
-// END $file_name_of_some_mir_dump_N
-```
-
-All the test information is in comments so the test is runnable.
-
-For each $file_name, compiletest expects [$expected_line_0, ...,
-$expected_line_N] to appear in the dumped MIR in order.  Currently it allows
-other non-matched lines before and after, but not between $expected_lines,
-should you want to skip lines, you must include an elision comment, of the form
-(as a regex) `//\s*...\s*`. The lines will be skipped lazily, that is, if there
-are two identical lines in the output that match the line after the elision
-comment, the first one will be matched.
-
-Examples:
-
-The following blocks will not match the one after it.
-
-```
-bb0: {
-    StorageLive(_1);
-    _1 = const true;
-    StorageDead(_1);
-}
-```
-
-```
-bb0: {
-    StorageLive(_1);
-    _1 = const true;
-    goto -> bb1
-}
-bb1: {
-    StorageDead(_1);
-    return;
-}
-```
-
-But this will match the one above,
-
-```
-bb0: {
-    StorageLive(_1);
-    _1 = const true;
-    ...
-    StorageDead(_1);
-    ...
-}
-```
-
-Lines match ignoring whitespace, and the prefix "//" is removed.
-
-It also currently strips trailing comments -- partly because the full file path
-in "scope comments" is unpredictable and partly because tidy complains about
-the lines being too long.
-
-compiletest handles dumping the MIR before and after every pass for you.  The
-test writer only has to specify the file names of the dumped files (not the
-full path to the file) and what lines to expect.  There is an option to rustc
-that tells it to dump the mir into some directly (rather then always dumping to
-the current directory).

src/test/mir-opt/address-of.rs

@@ -1,3 +1,5 @@
+// EMIT_MIR rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
+
 fn address_of_reborrow() {
     let y = &[0; 10];
     let mut z = &mut [0; 10];
@@ -35,78 +37,11 @@ fn address_of_reborrow() {
 }
 
 // The normal borrows here should be preserved
+// EMIT_MIR rustc.borrow_and_cast.SimplifyCfg-initial.after.mir
 fn borrow_and_cast(mut x: i32) {
     let p = &x as *const i32;
     let q = &mut x as *const i32;
     let r = &mut x as *mut i32;
 }
 
 fn main() {}
-
-// START rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
-// bb0: {
-//  ...
-//  _5 = &raw const (*_1); // & to *const casts
-//  ...
-//  _7 = &raw const (*_1);
-//  ...
-//  _11 = &raw const (*_1);
-//  ...
-//  _14 = &raw const (*_1);
-//  ...
-//  _16 = &raw const (*_1);
-//  ...
-//  _17 = &raw const (*_1); // & to *const coercions
-//  ...
-//  _18 = &raw const (*_1);
-//  ...
-//  _20 = &raw const (*_1);
-//  ...
-//  _22 = &raw const (*_1);
-// ...
-//  _24 = &raw const (*_2); // &mut to *const casts
-// ...
-//  _26 = &raw const (*_2);
-// ...
-//  _30 = &raw const (*_2);
-// ...
-//  _33 = &raw const (*_2);
-// ...
-//  _34 = &raw const (*_2); // &mut to *const coercions
-// ...
-//  _35 = &raw const (*_2);
-// ...
-//  _37 = &raw const (*_2);
-// ...
-//  _39 = &raw const (*_2);
-// ...
-//  _41 = &raw mut (*_2); // &mut to *mut casts
-// ...
-//  _43 = &raw mut (*_2);
-// ...
-//  _47 = &raw mut (*_2);
-// ...
-//  _50 = &raw mut (*_2);
-// ...
-//  _51 = &raw mut (*_2); // &mut to *mut coercions
-// ...
-//  _52 = &raw mut (*_2);
-// ...
-//  _54 = &raw mut (*_2);
-// ...
-//  _56 = &raw mut (*_2);
-// ...
-// }
-// END rustc.address_of_reborrow.SimplifyCfg-initial.after.mir
-
-// START rustc.borrow_and_cast.EraseRegions.after.mir
-// bb0: {
-//  ...
-//  _4 = &_1;
-//  ...
-//  _7 = &mut _1;
-//  ...
-//  _10 = &mut _1;
-//  ...
-// }
-// END rustc.borrow_and_cast.EraseRegions.after.mir