Get Remill building with LLVM 15 (#631)

* Get Remill building with LLVM 15

* Add missing header for x86 lift test

* Fix `enableOpaquePointers` calls

* Define a non-extern `__remill_state` in each Instructions module

* Remove `__remill_state` variables in tests

* Update build script to support LLVM 15

* Build with LLVM 15 in CI

* Bump CXX Common version

* Update Docker script

* Add comment explaining the definition of the state variable

* Correct wording

scripts/build.sh

@@ -23,11 +23,11 @@ DOWNLOAD_DIR="$( cd "$( dirname "${SRC_DIR}" )" && pwd )/lifting-bits-downloads"
 CURR_DIR=$( pwd )
 BUILD_DIR="${CURR_DIR}/remill-build"
 INSTALL_DIR=/usr/local
-LLVM_VERSION=llvm-14
+LLVM_VERSION=llvm-15
 OS_VERSION=
 ARCH_VERSION=
 BUILD_FLAGS=
-CXX_COMMON_VERSION="0.2.10"
+CXX_COMMON_VERSION="0.2.12"
 
 # There are pre-build versions of various libraries for specific
 # Ubuntu releases.
@@ -276,6 +276,10 @@ function GetLLVMVersion
       LLVM_VERSION=llvm-14
       return 0
     ;;
+    15)
+      LLVM_VERSION=llvm-15
+      return 0
+    ;;
     *)
       # unknown option
       echo "[x] Unknown or unsupported LLVM version ${1}. You may be able to manually build it with cxx-common."
@@ -291,7 +295,7 @@ function Help
   echo ""
   echo "Options:"
   echo "  --prefix           Change the default (${INSTALL_DIR}) installation prefix."
-  echo "  --llvm-version     Change the default (14) LLVM version."
+  echo "  --llvm-version     Change the default (15) LLVM version."
   echo "  --build-dir        Change the default (${BUILD_DIR}) build directory."
   echo "  --debug            Build with Debug symbols."
   echo "  --extra-cmake-args Extra CMake arguments to build with."

scripts/docker-lifter-entrypoint.sh

@@ -4,54 +4,12 @@
 
 V=""
 case ${LLVM_VERSION} in
-  llvm35*)
-    V=3.5
-  ;;
-  llvm36*)
-    V=3.6
-  ;;
-  llvm37*)
-    V=3.7
-  ;;
-  llvm38*)
-    V=3.8
-  ;;
-  llvm39*)
-    V=3.9
-  ;;
-  llvm4*)
-    V=4
-  ;;
-  llvm5*)
-    V=5
-  ;;
-  llvm6*)
-    V=6
-  ;;
-  llvm7*)
-    V=7
-  ;;
-  llvm8*)
-    V=8
-  ;;
-  llvm9*)
-    V=9
-  ;;
-  llvm10*)
-    V=10
-  ;;
-  llvm11*)
-    V=11
-  ;;
-  llvm12*)
-    V=12
-  ;;
-  llvm13*)
-    V=13
-  ;;
   llvm14*)
     V=14
   ;;
+  llvm15*)
+    V=15
+  ;;
   *)
     echo "Unknown LLVM version: ${LLVM_VERSION}"
     exit 1