[SYCL][Fusion] Remove LLVM include from header (#8017)

Remove includes of LLVM headers from the public surface of the JIT
compiler (i.e., public headers).

This avoids inheriting warnings from the LLVM codebase, which turn into
compilation errors when compiling the SYCL runtime with
`SYCL_ENABLE_WERROR=ON`.

Signed-off-by: Lukas Sommer <[email protected]>

Author: sommerlukas

sycl-fusion/jit-compiler/include/JITContext.h

@@ -9,14 +9,17 @@
 #ifndef SYCL_FUSION_JIT_COMPILER_JITCONTEXT_H
 #define SYCL_FUSION_JIT_COMPILER_JITCONTEXT_H
 
-#include "llvm/IR/LLVMContext.h"
 #include <mutex>
 #include <shared_mutex>
 #include <unordered_map>
 
 #include "Kernel.h"
 #include "Parameter.h"
 
+namespace llvm {
+class LLVMContext;
+} // namespace llvm
+
 namespace jit_compiler {
 
 ///

sycl-fusion/jit-compiler/include/KernelFusion.h

@@ -13,7 +13,9 @@
 #include "Kernel.h"
 #include "Options.h"
 #include "Parameter.h"
+#include <cassert>
 #include <string>
+#include <variant>
 #include <vector>
 
 namespace jit_compiler {

sycl-fusion/jit-compiler/lib/JITContext.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "JITContext.h"
+#include "llvm/IR/LLVMContext.h"
 
 using namespace jit_compiler;