Auto merge of #55010 - tromey:Bug-9224-generic-parameters, r=michaelwoerister

Add template parameter debuginfo to generic types

This changes debuginfo generation to add template parameters to
generic types.  With this change the DWARF now has
DW_TAG_template_type_param for types, not just for functions, like:

 <2><40d>: Abbrev Number: 6 (DW_TAG_structure_type)
    <40e>   DW_AT_name        : (indirect string, offset: 0x375): Generic<i32>
    <412>   DW_AT_byte_size   : 4
    <413>   DW_AT_alignment   : 4
...
 <3><41f>: Abbrev Number: 8 (DW_TAG_template_type_param)
    <420>   DW_AT_type        : <0x42a>
    <424>   DW_AT_name        : (indirect string, offset: 0xa65e): T

Closes #9224

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -1587,9 +1587,10 @@ extern "C" {
                                             LineNo: c_uint)
                                             -> &'a DINameSpace;
 
-    pub fn LLVMRustDICompositeTypeSetTypeArray(Builder: &DIBuilder<'a>,
-                                               CompositeType: &'a DIType,
-                                               TypeArray: &'a DIArray);
+    pub fn LLVMRustDICompositeTypeReplaceArrays(Builder: &DIBuilder<'a>,
+                                                CompositeType: &'a DIType,
+                                                Elements: Option<&'a DIArray>,
+                                                Params: Option<&'a DIArray>);
 
 
     pub fn LLVMRustDIBuilderCreateDebugLocation(Context: &'a Context,