Description: Support LLVM 6

LLVMContext::setDiagnosticHandler is renamed
LoopInfo::markAsRemoved is partly replaced by LoopInfo::erase,
but that doesn't remove the loop from the queue

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: https://lists.freedesktop.org/archives/beignet/2018-July/009211.html (original), https://lists.freedesktop.org/archives/beignet/2019-January/009222.html (#913141 fix)

--- a/backend/src/llvm/llvm_to_gen.cpp
+++ b/backend/src/llvm/llvm_to_gen.cpp
@@ -322,7 +322,11 @@ namespace gbe
     DataLayout DL(&mod);
     
     gbeDiagnosticContext dc;
+#if LLVM_VERSION_MAJOR >= 6
+    mod.getContext().setDiagnosticHandlerCallBack(&gbeDiagnosticHandler,&dc);
+#else
     mod.getContext().setDiagnosticHandler(&gbeDiagnosticHandler,&dc);
+#endif
 
 #if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 37
     mod.setDataLayout(DL);
--- a/backend/src/llvm/llvm_unroll.cpp
+++ b/backend/src/llvm/llvm_unroll.cpp
@@ -205,7 +205,10 @@ namespace gbe {
           if (parentTripCount != 0 && currTripCount * parentTripCount > 32) {
             //Don't change the unrollID if doesn't force unroll.
             //setUnrollID(parentL, false);
-#if LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 38
+#if LLVM_VERSION_MAJOR >= 6
+            LPM.markLoopAsDeleted(*parentL);
+            loopInfo.erase(parentL);
+#elif LLVM_VERSION_MAJOR * 10 + LLVM_VERSION_MINOR >= 38
             loopInfo.markAsRemoved(parentL);
 #else
             LPM.deleteLoopFromQueue(parentL);