Rename SpinMutex::AssertHeld to CheckLocked, for consistency with BlockingMutex.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@193447 91177308-0d34-0410-b5e6-96231b3b80d8
Overhaul the symbolizer interface.

This moves away from creating the symbolizer object and initializing the
external symbolizer as separate steps.  Those steps now always take place
together.

Sanitizers with a legacy requirement to specify their own symbolizer path
should use InitSymbolizer to initialize the symbolizer with the desired
path, and GetSymbolizer to access the symbolizer.  Sanitizers with no
such requirement (e.g. UBSan) can use GetOrInitSymbolizer with no need for
initialization.

The symbolizer interface has been made thread-safe (as far as I can
tell) by protecting its member functions with mutexes.

Finally, the symbolizer interface no longer relies on weak externals, the
introduction of which was probably a mistake on my part.

Differential Revision: http://llvm-reviews.chandlerc.com/D1985

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@193448 91177308-0d34-0410-b5e6-96231b3b80d8
Add a CMake option COMPILER_RT_DEBUG for building runtimes with full debug info.

Differential Revision: http://llvm-reviews.chandlerc.com/D1984

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@193449 91177308-0d34-0410-b5e6-96231b3b80d8