Fix typo found by Clang fix for extern "C" function handling.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185234 91177308-0d34-0410-b5e6-96231b3b80d8
Define the path to llvm-symbolizer tool in a common config to reduce copy-paste

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185286 91177308-0d34-0410-b5e6-96231b3b80d8
Always set -m32/-m64 flags for targeting i386/x86_64 respectively. Apparently, there are platforms where the clang defaults are different from gcc

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185287 91177308-0d34-0410-b5e6-96231b3b80d8