Move coverage tests from run-make-fulldeps to run-make

Fixes: #83830

The first commit was migrated from another PR that failed because CI had
errors likely resulting from trying to run the coverage tests in
run-make. (See: #84797 (comment))

So moving the tests should be done as it's own separate PR.

To attempt to resolve those CI errors, this PR also updates bootstrap to
add LLVM library link path to run-make.

When moving coverage tests from run-make-fulldeps to run-make,
some targets failed in CI with an obscure message:

failed to execute command: "musl-g++" "-ffunction-sections"
"-fdata-sections" "-fPIC" "-m32" "-march=i686" "-Wl,-melf_i386"
"-static" "-Wa,-mrelax-relocations=no" "-print-file-name=libstdc++.a"

error: No such file or directory (os error 2)

The coverage tests include # needs-profiler-support and these are the
first run-make tests to require it (as far as I can tell).

There is a special case in bootstrap for adding the LLVM library link
path, and it applies to run-make-fulldeps. This commit adds it for
run-make as well.

Author: richkadel

src/bootstrap/test.rs

@@ -1216,7 +1216,7 @@ note: if you're sure you want to do this, please open an issue as to why. In the
                 .arg(builder.ensure(tool::JsonDocCk { compiler: json_compiler, target }));
         }
 
-        if mode == "run-make" && suite.ends_with("fulldeps") {
+        if mode == "run-make" && !suite.ends_with("fulldeps") {
             let rust_demangler = builder
                 .ensure(tool::RustDemangler { compiler, target, extra_features: Vec::new() })
                 .expect("in-tree tool");

src/test/run-make-fulldeps/coverage/compiletest-ignore-dir

@@ -0,0 +1,3 @@
+# Directory "coverage" supports the tests at prefix ../coverage-*
+
+# Use ./x.py [options] test src/test/run-make/coverage to run all related tests.

src/test/run-make-fulldeps/coverage/coverage_tools.mk

@@ -0,0 +1,6 @@
+# Common Makefile include for Rust `run-make/coverage-* tests. Include this
+# file with the line:
+#
+# -include ../coverage/coverage_tools.mk
+
+-include ../../run-make-fulldeps/tools.mk