ac: avoid casting pointers on bcsel and stores

For variable pointers we really don't want to case the pointers to int
without a good reason, just add a wrapper for bcsel loading and result
storing.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/common/ac_llvm_build.h

@@ -128,6 +128,7 @@ unsigned ac_get_type_size(LLVMTypeRef type);
 
 LLVMTypeRef ac_to_integer_type(struct ac_llvm_context *ctx, LLVMTypeRef t);
 LLVMValueRef ac_to_integer(struct ac_llvm_context *ctx, LLVMValueRef v);
+LLVMValueRef ac_to_integer_or_pointer(struct ac_llvm_context *ctx, LLVMValueRef v);
 LLVMTypeRef ac_to_float_type(struct ac_llvm_context *ctx, LLVMTypeRef t);
 LLVMValueRef ac_to_float(struct ac_llvm_context *ctx, LLVMValueRef v);