Bump libigc to v1.0.8708. (#3650)

Author: maleadt

L/libigc/build_tarballs.jl

@@ -3,23 +3,25 @@
 using BinaryBuilder
 
 name = "libigc"
-version = v"1.0.8173"
+version = v"1.0.8708"
 
 # IGC depends on LLVM, a custom Clang, and a Khronos tool. Instead of building these pieces
 # separately, taking care to match versions and apply Intel-specific patches where needed
 # (i.e. we can't re-use Julia's LLVM_jll) collect everything here and perform a monolithic,
 # in-tree build with known-good versions.
 
 # Collection of sources required to build IGC
-# NOTE: these hashes are taken from the release notes in GitHub
+# NOTE: these hashes are taken from the release notes in GitHub,
+#       https://github.com/intel/intel-graphics-compiler/releases
 # NOTE: the SPIRV-LLVM-Translator doesn't match what's in the release notes,
-#       but gets checked out to $SPIRV_REV_PATCH in IGC/VectorCompiler/cmake/spirv.cmake
+#       but gets checked out to $SPIRV_REV_PATCH in IGC/VectorCompiler/cmake/spirv.cmake,
+#       https://github.com/intel/intel-graphics-compiler/blob/master/IGC/VectorCompiler/cmake/spirv.cmake
 sources = [
-    GitSource("https://github.com/intel/intel-graphics-compiler.git", "614876a3eb96433e13647adab2979bfa52dcd219"),
-    GitSource("https://github.com/intel/opencl-clang.git", "c8cd72e32b6abc18ce6da71c357ea45ba78b52f0"),
-    GitSource("https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git", "d429dc86342e522969209b65fdd5edce2bee799d"),
-    GitSource("https://github.com/intel/vc-intrinsics.git", "d9ffe1f9cbe45b296f098669173bcaeff12bfe99"),
-    GitSource("https://github.com/llvm/llvm-project.git", "d32170dbd5b0d54436537b6b75beaf44324e0c28"),
+    GitSource("https://github.com/intel/intel-graphics-compiler.git", "9ff8ff3d235cfac683ef91809c64247d6a43b887"),
+    GitSource("https://github.com/intel/opencl-clang.git", "fd68f64b33e67d58f6c36b9e25c31c1178a1962a"),
+    GitSource("https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git", "c67e6f26a7285aa753598ef792593ac4a545adf9"),
+    GitSource("https://github.com/intel/vc-intrinsics.git", "e5ad7e02aa4aa21a3cd7b3e5d1f3ec9b95f58872"),
+    GitSource("https://github.com/llvm/llvm-project.git", "1fdec59bffc11ae37eb51a1b9869f0696bfd5312"),
     # patches
     DirectorySource("./bundled"),
 ]