[Bug ipa/79375] New: gcc/ipa-prop.c:203:32: runtime error: reference binding to null pointer of type 'struct vec' after revision r244802

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79375

            Bug ID: 79375
           Summary: gcc/ipa-prop.c:203:32: runtime error: reference
                    binding to null pointer of type 'struct vec' after
                    revision r244802
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dominiq at lps dot ens.fr
                CC: jamborm at gcc dot gnu.org
  Target Milestone: ---

Compiling codes with -O and above with an instrumented compiler configured with

Using built-in specs.
COLLECT_GCC=gfcgp
COLLECT_LTO_WRAPPER=/opt/gcc/gcc7gp/libexec/gcc/x86_64-apple-darwin16.4.0/7.0.1/lto-wrapper
Target: x86_64-apple-darwin16.4.0
Configured with: ../p_work/configure --prefix=/opt/gcc/gcc7gp
--enable-languages=c,c++,fortran --with-gmp=/opt/mp-new --with-system-zlib
--with-isl=/opt/mp-new --disable-bootstrap --disable-multilib
--disable-libstdcxx CFLAGS='-L/opt/gcc/gcc7a/lib -lasan -lubsan
-fsanitize=address,undefined,leak -Og -g -fno-omit-frame-pointer'
CXXFLAGS='-fsanitize=address,undefined,leak -Og -g -fno-omit-frame-pointer'
LDFLAGS='-L/opt/gcc/gcc7a/lib -lasan -lubsan -ldl -lpthread'
Thread model: posix
gcc version 7.0.1 20170123 (experimental) [trunk revision 244802p2] (GCC) 

gives the following error

[Book15] f90/bug% gfcgp
/opt/gcc/_clean/gcc/testsuite/gfortran.dg/alloc_comp_class_5.f03 -O
../../p_work/gcc/ipa-prop.c:203:32: runtime error: reference binding to null
pointer of type 'struct vec'