[XCore] Move lowering of thread local storage to a separate pass.

Thread local storage is not supported by the XMOS linker so we handle
thread local variables by lowering the variable to an array of n elements
(where n is the number of hardware threads per core, currently 8
for all XMOS devices) indexed by the the current thread ID.

Previously this lowering was spread across the XCoreISelLowering and the
XCoreAsmPrinter classes. Moving this to a separate pass should be much
cleaner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181124 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/XCore/XCoreTargetMachine.cpp

@@ -46,6 +46,7 @@ public:
     return getTM<XCoreTargetMachine>();
   }
 
+  virtual bool addPreISel();
   virtual bool addInstSelector();
 };
 } // namespace
@@ -54,6 +55,11 @@ TargetPassConfig *XCoreTargetMachine::createPassConfig(PassManagerBase &PM) {
   return new XCorePassConfig(this, PM);
 }
 
+bool XCorePassConfig::addPreISel() {
+  addPass(createXCoreLowerThreadLocalPass());
+  return false;
+}
+
 bool XCorePassConfig::addInstSelector() {
   addPass(createXCoreISelDag(getXCoreTargetMachine(), getOptLevel()));
   return false;