ac: move some helpers to ac_llvm_build.c

We will call these from the radeonsi NIR backend.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/amd/common/ac_llvm_build.h

@@ -83,6 +83,14 @@ void
 ac_llvm_context_init(struct ac_llvm_context *ctx, LLVMContextRef context,
 		     enum chip_class chip_class, enum radeon_family family);
 
+int
+ac_get_llvm_num_components(LLVMValueRef value);
+
+LLVMValueRef
+ac_llvm_extract_elem(struct ac_llvm_context *ac,
+		     LLVMValueRef value,
+		     int index);
+
 unsigned ac_get_type_size(LLVMTypeRef type);
 
 LLVMTypeRef ac_to_integer_type(struct ac_llvm_context *ctx, LLVMTypeRef t);