various: Fix missing DumpModule with recent LLVM.

Since LLVM revision 293359 DumpModule gets only implemented when
either a debug build or LLVM_ENABLE_DUMP is set.

This patch adds a direct replacement for the function for radv and
radeonsi, However, as I don't know a good place to put common LLVM
code for all three I inlined the implementation for LLVMPipe.

v2: Use the new code for LLVM 3.4+ instead of LLVM 5+ & fixed indentation

Signed-off-by: Bas Nieuwenhuizen <basni@google.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/amd/common/ac_llvm_util.c

@@ -504,3 +504,11 @@ ac_prepare_cube_coords(struct ac_llvm_context *ctx,
 
 	memcpy(coords_arg, coords, sizeof(coords));
 }
+
+void
+ac_dump_module(LLVMModuleRef module)
+{
+	char *str = LLVMPrintModuleToString(module);
+	fprintf(stderr, "%s", str);
+	LLVMDisposeMessage(str);
+}