Insert a SmartMutex templated class into the class hierarchy, which takes a template parameter specifying whether this mutex
should become a no-op when not running in multithreaded mode.  Make sys::Mutex a typedef of SmartMutex<false>, to preserve source compatibility.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73709 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Mutex.cpp b/lib/System/Mutex.cpp
index d95c25b..a5e9920 100644
--- a/lib/System/Mutex.cpp
+++ b/lib/System/Mutex.cpp
@@ -23,11 +23,11 @@
 // Define all methods as no-ops if threading is explicitly disabled
 namespace llvm {
 using namespace sys;
-Mutex::Mutex( bool recursive) { }
-Mutex::~Mutex() { }
-bool Mutex::acquire() { return true; }
-bool Mutex::release() { return true; }
-bool Mutex::tryacquire() { return true; }
+MutexImpl::MutexImpl( bool recursive) { }
+MutexImpl::~MutexImpl() { }
+bool MutexImpl::acquire() { return true; }
+bool MutexImpl::release() { return true; }
+bool MutexImpl::tryacquire() { return true; }
 }
 #else
 
@@ -55,7 +55,7 @@
 static const bool pthread_enabled = true;
 
 // Construct a Mutex using pthread calls
-Mutex::Mutex( bool recursive)
+MutexImpl::MutexImpl( bool recursive)
   : data_(0)
 {
   if (pthread_enabled)
@@ -94,7 +94,7 @@
 }
 
 // Destruct a Mutex
-Mutex::~Mutex()
+MutexImpl::~MutexImpl()
 {
   if (pthread_enabled)
   {
@@ -106,7 +106,7 @@
 }
 
 bool
-Mutex::acquire()
+MutexImpl::acquire()
 {
   if (pthread_enabled)
   {
@@ -120,7 +120,7 @@
 }
 
 bool
-Mutex::release()
+MutexImpl::release()
 {
   if (pthread_enabled)
   {
@@ -134,7 +134,7 @@
 }
 
 bool
-Mutex::tryacquire()
+MutexImpl::tryacquire()
 {
   if (pthread_enabled)
   {