Rollup merge of rust-lang#124196 - RalfJung:mir-opt-tests, r=Mark-Simulacrum

mir-opt tests: rename unit-test -> test-mir-pass

"unit-test" is extremely non-descriptive, no idea how one is supposed to read that and know that this specifies the MIR pass being tested.

Author: jieyouxu

src/tools/compiletest/src/header.rs

@@ -244,7 +244,7 @@ mod directives {
     pub const STDERR_PER_BITWIDTH: &'static str = "stderr-per-bitwidth";
     pub const INCREMENTAL: &'static str = "incremental";
     pub const KNOWN_BUG: &'static str = "known-bug";
-    pub const MIR_UNIT_TEST: &'static str = "unit-test";
+    pub const TEST_MIR_PASS: &'static str = "test-mir-pass";
     pub const REMAP_SRC_BASE: &'static str = "remap-src-base";
     pub const COMPARE_OUTPUT_LINES_BY_SUBSET: &'static str = "compare-output-lines-by-subset";
     pub const LLVM_COV_FLAGS: &'static str = "llvm-cov-flags";
@@ -549,7 +549,7 @@ impl TestProps {
 
                     config.set_name_value_directive(
                         ln,
-                        MIR_UNIT_TEST,
+                        TEST_MIR_PASS,
                         &mut self.mir_unit_test,
                         |s| s.trim().to_string(),
                     );
@@ -922,7 +922,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "should-fail",
     "should-ice",
     "stderr-per-bitwidth",
-    "unit-test",
+    "test-mir-pass",
     "unset-exec-env",
     "unset-rustc-env",
     // tidy-alphabetical-end

tests/mir-opt/README.md

@@ -1,4 +1,4 @@
-//@ unit-test: SimplifyCfg-pre-optimizations
+//@ test-mir-pass: SimplifyCfg-pre-optimizations
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // Retagging (from Stacked Borrows) relies on the array index being a fresh
 // temporary, so that side-effects cannot change it.

tests/mir-opt/array_index_is_temporary.rs

@@ -1,4 +1,4 @@
-//@ unit-test: ElaborateDrops
+//@ test-mir-pass: ElaborateDrops
 //@ needs-unwind
 // this tests move up progration, which is not yet implemented
 

tests/mir-opt/basic_assignment.rs

@@ -1,4 +1,4 @@
-//@ unit-test: ElaborateDrops
+//@ test-mir-pass: ElaborateDrops
 //@ needs-unwind
 
 #![feature(rustc_attrs, stmt_expr_attributes)]

tests/mir-opt/box_expr.rs

@@ -1,5 +1,5 @@
 // skip-filecheck
-//@ unit-test: GVN
+//@ test-mir-pass: GVN
 //@ ignore-endian-big
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 static FOO: &[(Option<i32>, &[&str])] =

tests/mir-opt/const_allocation.rs

@@ -1,5 +1,5 @@
 // skip-filecheck
-//@ unit-test: GVN
+//@ test-mir-pass: GVN
 //@ ignore-endian-big
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 // EMIT_MIR const_allocation2.main.GVN.after.mir

tests/mir-opt/const_allocation2.rs

@@ -1,5 +1,5 @@
 // skip-filecheck
-//@ unit-test: GVN
+//@ test-mir-pass: GVN
 //@ ignore-endian-big
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 // EMIT_MIR const_allocation3.main.GVN.after.mir

tests/mir-opt/const_allocation3.rs

@@ -1,4 +1,4 @@
-//@ unit-test: ConstDebugInfo
+//@ test-mir-pass: ConstDebugInfo
 //@ compile-flags: -C overflow-checks=no -Zmir-enable-passes=+GVN
 
 struct Point {

tests/mir-opt/const_debuginfo.rs

@@ -1,4 +1,4 @@
-//@ unit-test: GVN
+//@ test-mir-pass: GVN
 
 // EMIT_MIR address_of_pair.fn0.GVN.diff
 pub fn fn0() -> bool {