Revert change that resulted in unnecessary casts

Author: andyleiserson

naga/src/back/hlsl/writer.rs

@@ -4506,10 +4506,10 @@ fn get_inner_matrix_of_global_uniform(
     base: Handle<crate::Expression>,
     func_ctx: &back::FunctionCtx<'_>,
 ) -> Option<MatrixType> {
-    let (mut current_base, _, _) = find_matrix_in_access_chain(module, base, func_ctx)?;
     let mut mat_data = None;
     let mut array_base = None;
 
+    let mut current_base = base;
     loop {
         let mut resolved = func_ctx.resolve_type(current_base, &module.types);
         if let TypeInner::Pointer { base, .. } = *resolved {

naga/tests/out/hlsl/wgsl-hlsl_mat_cx2.hlsl

@@ -53,17 +53,17 @@ void access_m()
     int _e31 = idx;
     float l_s_e_vv = asfloat(s_m.Load(_e31*4+_e29*8));
     float2x2 l_u_m = ((float2x2)u_m);
-    float2 l_u_c_c = ((float2)u_m._0);
+    float2 l_u_c_c = u_m._0;
     int _e40 = idx;
-    float2 l_u_c_v = ((float2)__get_col_of_mat2x2(u_m, _e40));
-    float l_u_e_cc = ((float)u_m._0.x);
+    float2 l_u_c_v = __get_col_of_mat2x2(u_m, _e40);
+    float l_u_e_cc = u_m._0.x;
     int _e49 = idx;
-    float l_u_e_cv = ((float)u_m._0[_e49]);
+    float l_u_e_cv = u_m._0[_e49];
     int _e53 = idx;
-    float l_u_e_vc = ((float)__get_col_of_mat2x2(u_m, _e53).x);
+    float l_u_e_vc = __get_col_of_mat2x2(u_m, _e53).x;
     int _e58 = idx;
     int _e60 = idx;
-    float l_u_e_vv = ((float)__get_col_of_mat2x2(u_m, _e58)[_e60]);
+    float l_u_e_vv = __get_col_of_mat2x2(u_m, _e58)[_e60];
     {
         float2x2 _value2 = l_u_m;
         s_m.Store2(0, asuint(_value2[0]));