Add precompiled headers test case

tests-lit/tests/filters/junk-detection/05_precompiled_headers/main.cpp

@@ -0,0 +1,22 @@
+// clang-format off
+
+int main() {
+  return sum(-2, 2);
+}
+
+/*
+
+RUN: cd %CURRENT_DIR
+
+RUN: %clang_cxx -c %S/main.hh -o %T/main.hh.pch
+RUN: cd / && env MULL_CONFIG=%S/mull.yml %clang_cxx %sysroot %pass_mull_ir_frontend -include-pch %T/main.hh.pch -g -grecord-command-line %s -o %s.exe
+RUN: (unset TERM; %mull_runner --allow-surviving -reporters=IDE -ide-reporter-show-killed %s.exe 2>&1; test $? = 0) | %filecheck %s --dump-input=fail --strict-whitespace --match-full-lines
+
+CHECK:[info] Killed mutants (1/1):
+CHECK-NEXT:{{^.*}}/main.hh:2:12: warning: Killed: Replaced + with - [cxx_add_to_sub]{{$}}
+CHECK-NEXT:  return a + b;
+CHECK-NEXT:           ^
+CHECK-NEXT:[info] All mutations have been killed
+CHECK-NEXT:[info] Mutation score: 100%
+
+*/

tests-lit/tests/filters/junk-detection/05_precompiled_headers/main.hh

@@ -0,0 +1,3 @@
+int sum(int a, int b) {
+  return a + b;
+}

tests-lit/tests/filters/junk-detection/05_precompiled_headers/mull.yml

@@ -0,0 +1,4 @@
+mutators:
+  - cxx_add_to_sub
+
+quiet: false