[PDB] Initialize the std::array<ulittle32_t> used for the gsi bitmap

With ASan, we would write about 512 bytes of malloc fill value to the
PDB, with some random bits ORed in here and there. Dumping the PDB would
always fail reliably.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309331 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed