Add LLVM FunctionPass regression test using run-make.

Part of https://github.com/rust-lang/rust/issues/31185.

Similar to https://github.com/rust-lang/rust/pull/31391.

src/test/run-make/llvm-module-pass/Makefile

@@ -1,14 +0,0 @@
--include ../tools.mk
-
-# Windows doesn't correctly handle include statements with escaping paths,
-# so this test will not get run on Windows.
-ifdef IS_WINDOWS
-all:
-else
-all: $(call NATIVE_STATICLIB,llvm-pass)
-	$(RUSTC) plugin.rs -C prefer-dynamic
-	$(RUSTC) main.rs
-
-$(TMPDIR)/libllvm-pass.o:
-	$(CXX) $(CFLAGS) $(LLVM_CXXFLAGS) -c llvm-pass.so.cc -o $(TMPDIR)/libllvm-pass.o
-endif

src/test/run-make/llvm-pass/Makefile

@@ -0,0 +1,17 @@
+-include ../tools.mk
+
+# Windows doesn't correctly handle include statements with escaping paths,
+# so this test will not get run on Windows.
+ifdef IS_WINDOWS
+all:
+else
+all: $(call NATIVE_STATICLIB,llvm-function-pass) $(call NATIVE_STATICLIB,llvm-module-pass)
+	$(RUSTC) plugin.rs -C prefer-dynamic
+	$(RUSTC) main.rs
+
+$(TMPDIR)/libllvm-function-pass.o:
+	$(CXX) $(CFLAGS) $(LLVM_CXXFLAGS) -c llvm-function-pass.so.cc -o $(TMPDIR)/libllvm-function-pass.o
+
+$(TMPDIR)/libllvm-module-pass.o:
+	$(CXX) $(CFLAGS) $(LLVM_CXXFLAGS) -c llvm-module-pass.so.cc -o $(TMPDIR)/libllvm-module-pass.o
+endif

src/test/run-make/llvm-pass/llvm-function-pass.so.cc

@@ -0,0 +1,56 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "llvm/Pass.h"
+#include "llvm/IR/Function.h"
+
+using namespace llvm;
+
+namespace {
+
+  class TestLLVMPass : public FunctionPass {
+
+  public:
+
+    static char ID;
+    TestLLVMPass() : FunctionPass(ID) { }
+
+    bool runOnFunction(Function &F) override;
+
+    const char *getPassName() const override {
+      return "Some LLVM pass";
+    }
+
+  };
+
+}
+
+bool TestLLVMPass::runOnFunction(Function &F) {
+  // A couple examples of operations that previously caused segmentation faults
+  // https://github.com/rust-lang/rust/issues/31067
+
+  for (auto N = F.begin(); N != F.end(); ++N) {
+    /* code */
+  }
+
+  LLVMContext &C = F.getContext();
+  IntegerType *Int8Ty  = IntegerType::getInt8Ty(C);
+  PointerType::get(Int8Ty, 0);
+  return true;
+}
+
+char TestLLVMPass::ID = 0;
+
+static RegisterPass<TestLLVMPass> RegisterAFLPass(
+  "some-llvm-function-pass", "Some LLVM pass");

src/test/run-make/llvm-pass/llvm-module-pass.so.cc

@@ -52,4 +52,4 @@ bool TestLLVMPass::runOnModule(Module &M) {
 char TestLLVMPass::ID = 0;
 
 static RegisterPass<TestLLVMPass> RegisterAFLPass(
-  "some-llvm-pass", "Some LLVM pass");
+  "some-llvm-module-pass", "Some LLVM pass");

src/test/run-make/llvm-pass/plugin.rs

@@ -15,12 +15,14 @@
 extern crate rustc;
 extern crate rustc_plugin;
 
-#[link(name = "llvm-pass", kind = "static")]
+#[link(name = "llvm-function-pass", kind = "static")]
+#[link(name = "llvm-module-pass", kind = "static")]
 extern {}
 
 use rustc_plugin::registry::Registry;
 
 #[plugin_registrar]
 pub fn plugin_registrar(reg: &mut Registry) {
-    reg.register_llvm_pass("some-llvm-pass");
+    reg.register_llvm_pass("some-llvm-function-pass");
+    reg.register_llvm_pass("some-llvm-module-pass");
 }