[AMDGPU] Intrinsic for launching whole wave functions (#145859)

Add the llvm.amdgcn.call.whole.wave intrinsic for calling whole wave
functions. This will take as its first argument the callee with the
amdgpu_gfx_whole_wave calling convention, followed by the call
parameters which must match the signature of the callee except for the
first function argument (the i1 original EXEC mask, which doesn't need
to be passed in). Indirect calls are not allowed.

Make direct calls to amdgpu_gfx_whole_wave functions a verifier error.

Unspeakable horrors happen around calls from whole wave functions, the
plan is to improve the handling of caller/callee-saved registers in
a future patch.

Tail calls are also handled in a future patch.

0 files changed, 0 insertions, 0 deletions