[asan] Runtime support for asan-instrument-allocas which enables instrumentation of variable-sized dynamic allocas. Patch by Max Ostapenko.

Reviewed at http://reviews.llvm.org/D6055


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222520 91177308-0d34-0410-b5e6-96231b3b80d8
sanitizer_common: fix function w/o return
When SANITIZER_USES_CANONICAL_LINUX_SYSCALLS the function misses return statement.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222532 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Allow the users of SymbolizationLoop to make use of the --dsym_hint option in llvm-symbolizer

Let the users of SymbolizationLoop define a function that produces the list of .dSYM hints (possible path to the .dSYM bundle) for the given binary.
Because the hints can't be added to an existing llvm-symbolizer process, we spawn a new symbolizer process ones each time a new hint appears.
Those can only appear for binaries that we haven't seen before.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222535 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Get fake stack code working with GCC 4.8.2.

Summary:
TestCases/Linux/heavy_uar_test.cc was failing on my
PowerPC64 box with GCC 4.8.2, because the compiler recognised
a memset-like loop and turned it into a call to memset, which
got intercepted by __asan_memset, which got upset because it was
being called on an address in high shadow memory.

Use break_optimization to stop the compiler from doing this.

Reviewers: kcc, samsonov

Reviewed By: kcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6266

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222572 91177308-0d34-0410-b5e6-96231b3b80d8
Don't make check-sanitizer depend on profile on Windows

We don't build the profiling library on Windows, so CMake warns that the
target doesn't exist.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222588 91177308-0d34-0410-b5e6-96231b3b80d8
Try to fix ARM buildbots

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@222619 91177308-0d34-0410-b5e6-96231b3b80d8