Assert on duplicate registration. Don't depend on function pointer equality.

Before this patch we would assert when building llvm as multiple shared
libraries (cmake's BUILD_SHARED_LIBS). The problem was the line

if (T.AsmStreamerCtorFn == Target::createDefaultAsmStreamer)

which returns false because of -fvisibility-inlines-hidden. It is easy
to fix just this one case, but I decided to try to also make the
registration more strict. It looks like the old logic for ignoring
followup registration was just a temporary hack that outlived its
usefulness.

This patch converts the ifs to asserts, fixes the few cases that were
registering twice and makes sure all the asserts compare with null.

Thanks for Joerg for reporting the problem and reviewing the patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192803 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ExecutionEngine/JIT/JITTest.cpp

@@ -721,16 +721,4 @@ TEST(LazyLoadedJITTest, EagerCompiledRecursionThroughGhost) {
 }
 #endif // !defined(__arm__) && !defined(__powerpc__) && !defined(__s390__)
 
-// This code is copied from JITEventListenerTest, but it only runs once for all
-// the tests in this directory.  Everything seems fine, but that's strange
-// behavior.
-class JITEnvironment : public testing::Environment {
-  virtual void SetUp() {
-    // Required to create a JIT.
-    InitializeNativeTarget();
-  }
-};
-testing::Environment* const jit_env =
-  testing::AddGlobalTestEnvironment(new JITEnvironment);
-
 }