Changes

AMDGPU/GlobalISel: Select llvm.amdgcn.raw.buffer.store
llvm-svn: 372292

AMDGPU/GlobalISel: Select llvm.amdgcn.raw.buffer.store.format
This needs special handling due to some subtargets that have a 
nonstandard register layout for f16 vectors
Also reject some illegal types on other targets.
llvm-svn: 372293

[CLANG][BPF] change __builtin_preserve_access_index() signature
The clang intrinsic __builtin_preserve_access_index() currently has
signature:
 const void * __builtin_preserve_access_index(const void * ptr)
This may cause compiler warning when:
 - parameter type is "volatile void *" or "const volatile void *", or
 - the assign-to type of the intrinsic does not have "const" qualifier. 
Further, this signature does not allow dereference of the builtin result
pointer as it is a "const void *" type, which adds extra step for the
user to do type casting.
Let us change the signature to:
 PointerT __builtin_preserve_access_index(PointerT ptr) such that the
result and argument types are the same. With this, directly
dereferencing the builtin return value becomes possible.
Differential Revision: https://reviews.llvm.org/D67734
llvm-svn: 372294