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set_analyzer_env.sh: improve cfi diagnostics

use -fno-sanitize-trap=cfi to allow a diagnostic to be printed rather
than aborting with a SIGILL.

https://clang.llvm.org/docs/ControlFlowIntegrity.html#trapping-and-diagnostics

Change-Id: I4517cafe3c7b7305ba4845dbadf9fb679c686843

--- a/tools/set_analyzer_env.sh

+++ b/tools/set_analyzer_env.sh

@@ -30,7 +30,7 @@

   *)

     echo "Usage: source set_analyzer_env.sh [<sanitizer>|clear]"

     echo "  Supported sanitizers:"

-    echo "    address integer memory thread undefined"

+    echo "    address cfi integer memory thread undefined"

     return 1

     ;;

 esac

@@ -77,8 +77,8 @@

 if [ "${sanitizer}" = "cfi" ]; then

   # https://clang.llvm.org/docs/ControlFlowIntegrity.html

-  cflags="${cflags} -flto -fvisibility=hidden"

-  ldflags="${ldflags} -flto -fuse-ld=gold"

+  cflags="${cflags} -fno-sanitize-trap=cfi -flto -fvisibility=hidden"

+  ldflags="${ldflags} -fno-sanitize-trap=cfi -flto -fuse-ld=gold"

   export AR="llvm-ar"

 fi