Preserve argument indexes when inlining MIR

We store argument indexes on VarDebugInfo. Unlike the previous method of
relying on the variable index to know whether a variable is an argument,
this survives MIR inlining.

We also no longer check if var.source_info.scope is the outermost scope.
When a function gets inlined, the arguments to the inner function will
no longer be in the outermost scope. What we care about though is
whether they were in the outermost scope prior to inlining, which we
know by whether we assigned an argument index.

compiler/rustc_middle/src/mir/mod.rs

@@ -1115,6 +1115,11 @@ pub struct VarDebugInfo<'tcx> {
 
     /// Where the data for this user variable is to be found.
     pub value: VarDebugInfoContents<'tcx>,
+
+    /// When present, indicates what argument number this variable is in the function that it
+    /// originated from (starting from 1). Note, if MIR inlining is enabled, then this is the
+    /// argument number in the original function before it was inlined.
+    pub argument_index: Option<u16>,
 }
 
 ///////////////////////////////////////////////////////////////////////////