[OPENMP]Fix PR49636: Assertion `(!Entry.getAddress() || Entry.getAddress() == Addr...

[OPENMP]Fix PR49636: Assertion `(!Entry.getAddress() || Entry.getAddress() == Addr) && "Resetting with the new address."' failed.

The original issue is caused by the fact that the variable is allocated
with incorrect type i1 instead of i8. This causes the bitcasting of the
declaration to i8 type and the bitcast expression does not match the
original variable.
To fix the problem, the UndefValue initializer and the original
variable should be emitted with type i8, not i1.

Differential Revision: https://reviews.llvm.org/D99297