[ASan] Print exact source location of global variables in error reports.

See https://code.google.com/p/address-sanitizer/issues/detail?id=299 for the
original feature request.

Introduce llvm.asan.globals metadata, which Clang (or any other frontend)
may use to report extra information about global variables to ASan
instrumentation pass in the backend. This metadata replaces
llvm.asan.dynamically_initialized_globals that was used to detect init-order
bugs. llvm.asan.globals contains the following data for each global:
  1) source location (file/line/column info);
  2) whether it is dynamically initialized;
  3) whether it is blacklisted (shouldn't be instrumented).

Source location data is then emitted in the binary and can be picked up
by ASan runtime in case it needs to print error report involving some global.
For example:

  0x... is located 4 bytes to the right of global variable 'C::array' defined in '/path/to/file:17:8' (0x...) of size 40

These source locations are printed even if the binary doesn't have any
debug info.

This is an ABI-breaking change. ASan initialization is renamed to
__asan_init_v4(). Pre-built libraries compiled with older Clang will not work
with the fresh runtime.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212188 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: Temporarily disable AArch64AddressTypePromotion

Temporarily disable AArch64AddressTypePromotion, which was effectively
re-enabled in r212073 and r212075, while I look into PR20188.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212189 91177308-0d34-0410-b5e6-96231b3b80d8
XFAIL the test to go with r202189

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212190 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: Merge isa with dyn_cast

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212194 91177308-0d34-0410-b5e6-96231b3b80d8
Just adding a getHalfTy method to IRBuilder for completeness.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212195 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Fix crashes when an illegal type load or store is not handled.

I don't think anything hits this now, but will be exposed in future
patches.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212197 91177308-0d34-0410-b5e6-96231b3b80d8