[GWP-ASan] 32-bit test pointers, allow multi-init for test.

Summary:
GWP-ASan test currently fail on 32-bit platforms, as some of the pointers are
larger than `uintptr_t` on 32-bit platforms. Fix up all those instances.

Also add an uncompress varint test where the result is an underflow.

Furthermore, allow multi-init for testing. Each gtest when running
`check-gwp_asan` apparently runs in its own instance, but when integrating
these tests into Android, this behaviour isn't the same. We remove the
global multi-init check here, to allow for testing to work elsewhere, and we're
not really worried about multi-init anyway as it's part of our contract with
the allocator.

Reviewers: eugenis, vlad.tsyrklevich

Reviewed By: eugenis

Subscribers: #sanitizers, llvm-commits, pcc

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D71121

0 files changed, 0 insertions, 0 deletions