Add a MIR test for integer methods in debug

Author: scottmcm

tests/mir-opt/pre-codegen/integer_methods_debug.cast_and_add.PreCodegen.after.panic-abort.mir

@@ -0,0 +1,19 @@
+// MIR for `cast_and_add` after PreCodegen
+
+fn cast_and_add(_1: i32) -> u32 {
+    debug x => _1;
+    let mut _0: u32;
+    let mut _2: u32;
+
+    bb0: {
+        _2 = core::num::<impl i32>::cast_unsigned(copy _1) -> [return: bb1, unwind unreachable];
+    }
+
+    bb1: {
+        _0 = core::num::<impl u32>::wrapping_add(move _2, const 42_u32) -> [return: bb2, unwind unreachable];
+    }
+
+    bb2: {
+        return;
+    }
+}

tests/mir-opt/pre-codegen/integer_methods_debug.cast_and_add.PreCodegen.after.panic-unwind.mir

@@ -0,0 +1,19 @@
+// MIR for `cast_and_add` after PreCodegen
+
+fn cast_and_add(_1: i32) -> u32 {
+    debug x => _1;
+    let mut _0: u32;
+    let mut _2: u32;
+
+    bb0: {
+        _2 = core::num::<impl i32>::cast_unsigned(copy _1) -> [return: bb1, unwind continue];
+    }
+
+    bb1: {
+        _0 = core::num::<impl u32>::wrapping_add(move _2, const 42_u32) -> [return: bb2, unwind continue];
+    }
+
+    bb2: {
+        return;
+    }
+}

tests/mir-opt/pre-codegen/integer_methods_debug.rs

@@ -0,0 +1,12 @@
+//@ compile-flags: -Copt-level=0 -Zmir-opt-level=1 -Cdebuginfo=limited
+// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
+#![crate_type = "lib"]
+
+// EMIT_MIR integer_methods_debug.cast_and_add.PreCodegen.after.mir
+pub fn cast_and_add(x: i32) -> u32 {
+    // CHECK-LABEL: fn cast_and_add(_1: i32) -> u32
+    // CHECK: _2 = {{.+}}<impl i32>::cast_unsigned(copy _1)
+    // CHECK: _0 = {{.+}}<impl u32>::wrapping_add(move _2, const 42_u32) ->
+    x.cast_unsigned().wrapping_add(42)
+}