LDC 0.12.1

Big news:

• Improvements to the gc2stack pass which now allows to clean up allocations left behind by inlined closures.
• The inline assembler now parses all SSE4.1, SSE4.2, AES and SHA opcodes (#514).

Platform support:

• Added new LLVM 3.4 intrinsics to ldc/intrinsics.di.
• Added LLVM 3.5 support in druntime and phobos.

Bug fixes:

• Signature of _d_newclass is now correct.
• Fixed a bug in the va_arg handling (affected Linux/PPC64 and other non-x86 platforms).
• Fixed duplicate definitions of vtables/interface (#535).
• Static immutable variables are now in read-only data segment (#543).
• Dmd is not mentioned anymore in the error message if object.di can not be found.

Building LDC:

• It is now possible to compile LDC with the AddressSanitizer enabled (clang only). Just specify -DSANITIZE=ON on the CMake command line. This is currently only helpful for debugging LDC itself.