ThreadLocal: Return a mutable pointer if templated with a non-const type

It makes more sense for ThreadLocal<const T>::get to return a const T*
and ThreadLocal<T>::get to return a T*.

llvm-svn: 224225
diff --git a/llvm/lib/Support/ThreadLocal.cpp b/llvm/lib/Support/ThreadLocal.cpp
index 2dec9eb..e062219 100644
--- a/llvm/lib/Support/ThreadLocal.cpp
+++ b/llvm/lib/Support/ThreadLocal.cpp
@@ -31,7 +31,7 @@
   void **pd = reinterpret_cast<void**>(&data);
   *pd = const_cast<void*>(d);
 }
-const void* ThreadLocalImpl::getInstance() {
+void *ThreadLocalImpl::getInstance() {
   void **pd = reinterpret_cast<void**>(&data);
   return *pd;
 }
@@ -72,7 +72,7 @@
   (void) errorcode;
 }
 
-const void* ThreadLocalImpl::getInstance() {
+void *ThreadLocalImpl::getInstance() {
   pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data);
   return pthread_getspecific(*key);
 }
diff --git a/llvm/lib/Support/Unix/ThreadLocal.inc b/llvm/lib/Support/Unix/ThreadLocal.inc
index f14d0fa..fa746a6 100644
--- a/llvm/lib/Support/Unix/ThreadLocal.inc
+++ b/llvm/lib/Support/Unix/ThreadLocal.inc
@@ -21,6 +21,6 @@
 ThreadLocalImpl::ThreadLocalImpl() : data() { }
 ThreadLocalImpl::~ThreadLocalImpl() { }
 void ThreadLocalImpl::setInstance(const void* d) { data = const_cast<void*>(d);}
-const void* ThreadLocalImpl::getInstance() { return data; }
+void *ThreadLocalImpl::getInstance() { return data; }
 void ThreadLocalImpl::removeInstance() { setInstance(0); }
 }
diff --git a/llvm/lib/Support/Windows/ThreadLocal.inc b/llvm/lib/Support/Windows/ThreadLocal.inc
index 14ce619..b9cb8ff 100644
--- a/llvm/lib/Support/Windows/ThreadLocal.inc
+++ b/llvm/lib/Support/Windows/ThreadLocal.inc
@@ -34,7 +34,7 @@
   TlsFree(*tls);
 }
 
-const void* ThreadLocalImpl::getInstance() {
+void *ThreadLocalImpl::getInstance() {
   DWORD* tls = reinterpret_cast<DWORD*>(&data);
   return TlsGetValue(*tls);
 }