Fix incorrect results in ReachSafety-Heap

[hbgit]

Verification results from SV-COMP

• ../../sv-benchmarks/c/ldv-regression/sizeofparameters_test.i

  Incorrect long int a = __VERIFIER_nondet_long(); representation

• ../../sv-benchmarks/c/ldv-regression/test27-2.c

  Expected FALSE, but the result is TRUE
  Check:
  libfuzzer -> ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address
  KLEE -> memory error: out of bound pointer
  OR -> Struct modeling error

• ../../sv-benchmarks/c/ldv-regression/test28-1.c
  >> Same ERROR as the ldv-regression/test27-2.c