For PR351:
* Make sure all headers used by lib/System have checks
* Use "standard" autoconf checks for certain problematic headers
For PR432:
* Resurrect --with-llvmgccdir so a specific llvm-gcc/llvm-g++ installation
  can be specified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19142 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed