Fix LLVM 14 build (rust-lang#630)

Author: wsmoses

.github/workflows/enzyme-ci.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        llvm: ["7", "8", "9", "10", "11", "12", "13"] #, "14"]
+        llvm: ["7", "8", "9", "10", "11", "12", "13", "14"]
         build: ["Release", "Debug"] # "RelWithDebInfo"
         os: [ubuntu-20.04, ubuntu-18.04] #self-hosted]
 

enzyme/Enzyme/Enzyme.cpp

@@ -792,11 +792,19 @@ class Enzyme : public ModulePass {
               element = Builder.CreateBitCast(
                   element, PointerType::get(Type::getInt8Ty(CI->getContext()),
                                             elementPtrTy->getAddressSpace()));
+#if LLVM_VERSION_MAJOR >= 7
+              element = Builder.CreateGEP(
+                  Type::getInt8Ty(CI->getContext()), element,
+                  Builder.CreateMul(
+                      batchOffset[i - 1],
+                      ConstantInt::get(batchOffset[i - 1]->getType(), v)));
+#else
               element = Builder.CreateGEP(
                   element,
                   Builder.CreateMul(
                       batchOffset[i - 1],
                       ConstantInt::get(batchOffset[i - 1]->getType(), v)));
+#endif
               element = Builder.CreateBitCast(element, elementPtrTy);
             } else {
               return false;