Update llvm flags and Ubuntu distro

Author: alex

.travis.yml

@@ -1,7 +1,7 @@
 language: rust
 sudo: false
 cache: cargo
-dist: trusty
+dist: bionic
 rust:
   - nightly
 os:
@@ -12,8 +12,8 @@ notifications:
   email: false
 script:
   - cd example
-  - cargo rustc --release -- -Cpasses='sancov' -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-trace-compares -Cpanic=abort -Cllvm-args=-sanitizer-coverage-trace-divs -Cllvm-args=-sanitizer-coverage-trace-geps -Cllvm-args=-sanitizer-coverage-prune-blocks=0 -Zsanitizer=address
+  - cargo rustc --release -- -Cpasses='sancov' -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-trace-compares -Cllvm-args=-sanitizer-coverage-inline-8bit-counters -Cllvm-args=-sanitizer-coverage-stack-depth -Cllvm-args=-sanitizer-coverage-trace-geps -Cllvm-args=-sanitizer-coverage-prune-blocks=0 -Zsanitizer=address
   - (! ./target/release/example -runs=100000)
   - cd ../example_arbitrary
-  - cargo rustc --release -- -Cpasses='sancov' -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-trace-compares -Cpanic=abort -Cllvm-args=-sanitizer-coverage-trace-divs -Cllvm-args=-sanitizer-coverage-trace-geps -Cllvm-args=-sanitizer-coverage-prune-blocks=0 -Zsanitizer=address
+  - cargo rustc --release -- -Cpasses='sancov' -Cllvm-args=-sanitizer-coverage-level=4 -Cllvm-args=-sanitizer-coverage-trace-compares -Cllvm-args=-sanitizer-coverage-inline-8bit-counters -Cllvm-args=-sanitizer-coverage-stack-depth -Cllvm-args=-sanitizer-coverage-trace-geps -Cllvm-args=-sanitizer-coverage-prune-blocks=0 -Zsanitizer=address
   - (! ./target/release/example -runs=10000000)