Update llvm/clang/lld to the latest version

This version fixes issues with linking mingw-style SEH data (making
sure all unwind info is included), adds support for assembler
directives like .rva, which often is used in SEH contexts, and
updates clang's unwind.h to match the libgcc ABI for SEH unwinding.

build-llvm.sh

@@ -37,13 +37,13 @@ fi
 if [ -n "$SYNC" ] || [ -n "$CHECKOUT" ]; then
     cd llvm
     [ -z "$SYNC" ] || git fetch
-    git checkout b79cc9e7eb39c60a1f51e185490ea177252687e0
+    git checkout eeed30a7348ab657ef8a25a1978b20477d77d020
     cd tools/clang
     [ -z "$SYNC" ] || git fetch
-    git checkout 561a0afd9c46b4ca38b09ee5a4b8115394cd4917
+    git checkout e7a60053bd055e4869550052ea1756c7d87b5ca9
     cd ../lld
     [ -z "$SYNC" ] || git fetch
-    git checkout 7002cf666988fabf24198f8608c2f79277b5b96a
+    git checkout d8dd02ff738d40a11226cc86aa92634bfe80572b
     cd ../../..
 fi