move hir-tree test from run-make to ui test

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -86,7 +86,6 @@ run-make/foreign-exceptions/Makefile
 run-make/foreign-rust-exceptions/Makefile
 run-make/fpic/Makefile
 run-make/glibc-staticlib-args/Makefile
-run-make/hir-tree/Makefile
 run-make/inaccessible-temp-dir/Makefile
 run-make/include_bytes_deps/Makefile
 run-make/incr-add-rust-src-component/Makefile

tests/run-make/hir-tree/Makefile

@@ -1,8 +0,0 @@
-include ../tools.mk
-
-# Test that hir-tree output doesn't crash and includes
-# the string constant we would expect to see.
-
-all:
-	$(RUSTC) -o $(TMPDIR)/input.hir -Z unpretty=hir-tree input.rs
-	$(CGREP) '"Hello, Rustaceans!\n"' < $(TMPDIR)/input.hir

tests/run-make/hir-tree/input.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, Rustaceans!");
-}

tests/ui/unpretty/hir-tree.rs

@@ -0,0 +1,10 @@
+//@ build-pass
+//@ compile-flags: -o - -Zunpretty=hir-tree
+//@ check-stdout
+//@ dont-check-compiler-stdout
+//@ dont-check-compiler-stderr
+//@ regex-error-pattern: Hello, Rustaceans!
+
+fn main() {
+    println!("Hello, Rustaceans!");
+}