ci: Add job with -fsanitize-memory-param-retval

.github/workflows/ci.yml

@@ -485,18 +485,24 @@ jobs:
  matrix:
  configuration:
  - env_vars:
+ CTIMETESTS: 'yes'
  CFLAGS: '-fsanitize=memory -fsanitize-recover=memory -g'
  - env_vars:
  ECMULTGENKB: 2
  ECMULTWINDOW: 2
+ CTIMETESTS: 'yes'
  CFLAGS: '-fsanitize=memory -fsanitize-recover=memory -g -O3'
+ - env_vars:
+ # -fsanitize-memory-param-retval is clang's default, but our build system disables it
+ # when ctime_tests when enabled.
+ CFLAGS: '-fsanitize=memory -fsanitize-recover=memory -fsanitize-memory-param-retval -g'
+ CTIMETESTS: 'no'
 
  env:
  ECDH: 'yes'
  RECOVERY: 'yes'
  SCHNORRSIG: 'yes'
  ELLSWIFT: 'yes'
- CTIMETESTS: 'yes'
  CC: 'clang'
  SECP256K1_TEST_ITERS: 32
  ASM: 'no'