[nolibc] Make SymbolizerPrepareForSandboxing weak and optional.

Differential Revision: http://llvm-reviews.chandlerc.com/D872

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182765 91177308-0d34-0410-b5e6-96231b3b80d8
[nolibc] Add a test case for Linux/x86_64.

Differential Revision: http://llvm-reviews.chandlerc.com/D873

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182770 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Change report header to be more alike to ASan and TSan.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182774 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] Improve getaddrinfo interceptor.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182775 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] Share TSan accept & accept4 interceptors with other sanitizers.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182835 91177308-0d34-0410-b5e6-96231b3b80d8
Make InternalAlloc/InternalFree in sanitizer runtimes libc-free by switching to a custom allocator.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182836 91177308-0d34-0410-b5e6-96231b3b80d8
Exclude sanitizer_nolibc_test from TSan test run. Fix lint warnings

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@182837 91177308-0d34-0410-b5e6-96231b3b80d8